Tractatus LogicoPhilosophicus/Index
←7  Tractatus LogicoPhilosophicus (1922) , translated by Charles Kay Ogden Index 
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London: Routledge & Kegan Paul pages 191207 
INDEX^{[1]}
(Note : Numbers in parentheses refer to paragraphs. Thus "6.2II (2)" indicates the second paragraph of section 6. 211.)
A priori
 all inference is, 5.133
 always proves to be something logical, 6.3211
 criterion of such a thought, 3.04
 geometry is, 6.35 (1)
 intuitions, scientific principles as, 6.34
 no part of experience is, 5.634
 possibility of a logical form as, 6.33
 what logic's being, consists in, 5.4731
Accident, none in logic, 2.012
Aesthetics, 6.421 (3)
Affirmation, logical property of, 6.231 (1)
Alphabet, 4.016 (2)
Ambiguity, of "property" and other words, 4.123 (3)
Analysis of propositions, 2.0201, 3.201, 3.25, 4.221 (1)
"Ambulo," a composite proposition, 4.032 (2)
Analytical propositions, 6.11
Application, successive
 defined, 5.2521 (1)
 equivalent to "and so on", 5.2523
Argument
 function cannot be its own, 3.333 (1)
 places, and generality, 4.0411 (2)
Assertion
 and deducibility, 5.124 (1)
 cannot give a sense, 4.064
Assertion sign, meaningless, 4.442 (2)
Atomic facts (Sachverhalt)
 are combinations of things, 2.01, 2.03
 are mutually independent, 2.061, 2.062, 4.27 (2)
 number of combinations of, 4.27 (1)
 possible infinity of, 4.2211
 possibility of, 2.012, 2.0124
 possibility of occurrence of things in, 2.0121 (2)
 relation to elementary propositions, 4.21, 4.25
 relation to facts, 2
 relation to propositions, 4.1
 structure of, 2.032
Axiom of Infinity, 5.535 (2, 3)
Axiom of Reducibility, 6.1232, 6.1233
Brackets, their importance, 5.461
Calculation
 not an experiment, 6.2331 (2)
 of logical properties of symbols, 6.126 (i) Case, the (der Fall)
 and substance, 2.024
 and the world, 1
 equated with fact, 2
 is existence of atomic facts, 2
Causality: no causal nexus, 5.136. 5.1361
Causality, law of
 as limit of the describable, 6.362
 cannot be said, 6.36 (2)
 is form of a law, 6.32, 6.321, 6.361
Certainty
 as limiting case of probability, 5.152 (3)
 of truth of tautology, 4.464 (1)
 opposed to possibility and impossibility, 4.464 (2)
Clarity: everything can be said and thought clearly, 4. 116
Classes, theory of, superfluous in mathematics, 6.031 (1)
Colloquial language. See Ordinary language
Colour
 a form of objects, 2.0251
 logical structure of, 6.3751
"Complex," a formal concept, 4.1272 (7, 8)
Complexes
 and definition, 3.24 (4)
 given only by descriptions, 324 (2)
 how perceived, 5.5423
 propositions about, in internal relation to a statement about constituents, 3.24 (1)
 statements about, analysable, 2.0201
Configuration of objects, 2.0272, 3.21. (See also Structure)
Constant : expression as, 3.312 (2)
Contradiction. (See also Denial)
 defined, 4.46 (4)
 limiting case of combination of symbols, 4.466 (4)
 not a picture of reality, 4.462
 shared by propositions, 5.143
Correspondence
 between objects and picture elements, 2.13
 of configuration of simple signs and objects, 3.21
Darwinian theory, irrelevant to philosophy, 4.1122
Death, 6.431, 6.4311
Deducibility
 and identity, 5. 141
 and obviousness, 5.1363
 and relative content, 5.14
 and structure, 5.13
 relation to form, illustrated, 5.1311 (1)
Definition
 as analysis, 3.26
 as rule of translation, 3.343
 effect upon signification, 3.261 (1)
 how symbolized, 4.241 (3)
 of a symbol for a complex, 3.24 (4)
 'complete analysis' (of proposition), 3.201
 of 'contradiction', 4.46 (4)
 of 'expression', 3.31 (1)
 of 'feature', 4.1221
 of 'form', 2.033
 of 'form of an object', 2.0141
 of 'form of representation', 2.151
 of 'formal concept', 4.126 (1)
 of 'formal series', 4.1252 (1)
 of 'independent propositions', 5.152 (1)
 of 'logical picture', 2.181
 of 'logical place', 3.41
 of 'measure of probability', 515
 of 'name', 3.202
 of negation ' (in sense of simultaneous denial), 5.5
 of 'number', 6.022 (2)
 of numbers, 6.02
 of 'operation', 5.23
 of 'propositional sign', 3.12
 of ' propositional variable', 3.313 (3)
 of 'range', 4.463
 of 'sign', 3.32
 of 'simple sign', 3.201
 of 'structure' (of atomic facts) 2.032
 of 'successive application', 5.2521 (1)
 of 'successor', 4.1252 (4)
 of 'tautology', 4.46 (4)
 of 'truthgrounds', 5.101 (2)
 of 'truthoperations', 5.234
 of 'truthpossibilities', 4.3
 only an expedient in presentation, 4.242
 rules for, 5.451 (2)
Denial
 as determining logical place, 4.0641
 by means of what is common to all negation symbols, 5.512 (2)
 is an operation, 5.2341 (2)
 needs a single definition, 5.451
 possibility of, presupposed in affirmation, 5.44 (4)
 occurrence of, does not characterize sense, 4.0621 (2)
 reverses sense, 5.2341 (3)
Denial, sign of
 corresponds to nothing in reality, 4.0621
 does not refer to an object, 5.44 (5)
Description
 of a fact by a proposition, 4.023 (3)
 of an object, 4.023 (4)
 of complex, 3.24 (2)
 of expressions, 3.33
 of propositions, 3.317 (2)
 of reality by a proposition, 4.023 (2)
 of states of affairs, 3.144
 of the world
Descriptions, systems of, 6.341
Distinguishability, 2.02331
"Dynamic models", 4.04 (2)
Ego, the nonpsychological, 5.641
Elucidation of primitive signs, 3.263
Equality, meaning of sign of, 6.23 (1)
Equations
 as expressing substitutability, 6.24 (2)
 characterize a standpoint, 6.2323
 not needed to express synonymity, 6.232 (2)
Equiprobability, 5.154 (3)
Essence
 and general form of proposition, 5.471
 of notation, 3.342
 of pictorial nature, 4.013
 of propositions, 3.341, 4.027, 4.03, 4.016, 4.5 (2), 5.471
 of representation, 4.016
 of symbol, 3.341, 3.343. 4.465
 of the world, 5.4711
Essential property, of a thing, to be a possible constituent of atomic fact, 2.011
Eternity, 6.431 1
Ethics, 6.421, 6.422
Existence
 of atomic facts, 2.1 1, 4.1
 of logical place, 3.4
Expedients, in logic, 5.452
Exponent, of an operation, 6.021
Expressions
 all that need to be translated, 4.025 (1)
Expressions — continued
 guarantee existence of the logical place, 3.4
have meaning only in a proposition, 3.314 (1)
 presented by a variable, 3.313 (1)
 the proposition is a function of them, 3.318
 the term defined, 3.31 (1)
External property, 2.01231, 2.0233. (See also Internal property)
"Fact", a formal concept, 4.1272 (7, 8)
Facts (Tatsache). (See also States of affairs and Atomic facts)
 and pictures, 2.1, 2. 11
 compose the world, i.i, 1.2
 existence of, 2
 mutual independence of, 1.21
 negative, 2.06 (2)
 required for expression of sense, 3.142
 the world divides into, 1.2
 totality of, 1.11
Fate, and the ancients, 6.372 (1)
Feature, explained, 4.1221
Features of symbols, express formal properties, 4.125 (6)
Form. (See also Possibility)
 and possibility of structure, 2.033
 and substance, 2.025
 cannot be said to have properties, 4. 1 241
 general, of propositions, 4.5, 4.47
 general prepositional,
 and truth operations, 5.54
 is a variable, 4.53
 logical, 2.18. (See also Prototype)
 and variable, 3.315
 cannot be represented in proposition, 4.12, 4.121 (1)
 how determined by a sign, 3.327
 of propositions, 4.0031
 of a spot, 4.063
 of expressions, 3.31 (4)
 shown by substitutability, 6.23 (2)
 of functions, 3.333 (2)
 of objects, 2.0141, 2.0233, 2.0251
 of propositions, 3.311
 of reality, 2.18
 of representation
 defined, 2.151
 function of, in pictures, 2.22
 is shown forth, 2.172
 of the world consists of objects 2.0223
 of values of a variable, 4.1271 (2)
Formal, equated with logical 6.12 (1)
Formal concept
 already given with object to which it applies, 4.12721
 as primitive idea, 4.12721
 characteristics of, 4.126 (5, 7)
 defined, 4.126 (1)
 examples of, 4.1272 (7, 8)
 expressed by variables, 4.126 (8), 4.127
 opposed to "proper" concept, 4.126 (2)
 questions about existence of,
 senseless, 4.127
Formal law, as determining formal series, 5.501 (6)
Formal properties
 connexion with structure, 5.321
 explained, 4.122 (1)
 expressed by features of symbols, 4.126 (6)
Formal series
 defined, 4.1252 (1)
 example of, 4.45 (2)
 expression for general term of, 5.2522
 general term of, 4.1273 (2)
 needs variables, 4.1273
 of truth functions, 5.1 (1)
 progress from term to term of, 5.252
Freedom of the will, 5.1362 (1)
Frege, 3.143, 3.318, 3.325, 4.063 (1), 4.1272 (8), 41273, 4.4431, 5.02 (3), 5.132 (4), 5.42, 5.451, 5.4733 (1), 5.521, 6.1271, 6.232 (1)
Frequency, of occurrence of events, 5.154 (1)
"Function", a formal concept, 4.1273 (7, 8)
Function
 and composition, 5.47 (3)
 cannot be its own argument, 3333. 5.251
 cannot present formal concepts, 4.126 (4)
 distinct from operation, 5.25 (3)
 elementary proposition is a, of names 4.24 (2)
 proposition is a, of names, 3.318, 4.24 (2)
Future, no knowledge of, 6.26311
Generality
 accidental, 6.031 (2), 6.1232
 concept of, separated from truthfunction, 5.521
 essential
 needed in mathematics, 6.031 (2)
 opposed to accidental generality, 6.1232
 how shown, 5.1311 (2)
 how symbolized, 4.0411
 its notation contains a prototype, 3.24 (3). 5.522
 symbol for, occurs as an argument, 5.523
 symbolism for, makes constants prominent, 5.522
 refers to logical prototype, 5.522
Geometrical place, and possibility, 3.41 1
Geometry, as a priori, 6.35 (1)
God, 6.432, 6.372 (1)
"Green is green", 3.323 (3)
Hertz, 4.04 (2), 6.361
Hieroglyphic writing, 4.016
Idealists, their explanation of seeing spatial relations, 4.0412
Identity
 cannot be asserted, 6.2322
 criticism of Russell's definition of, 5.5302
 how expressed, 5.53, 5.531, 5.532. 5.5321
 not a property, 5.473 (2)
 not a relation between objects, 5.5301 (1)
 of signtokens, 3.203
 sign of
 dispensable, 5.533, 6.232 (2)
 its meaning, 4.241 (2)
Immortality, 6.4312 (1)
Inconceivability, and internality of properties, 4.123
Independence, of propositions, defined, 5.152 (1)
Index (of a name)
 explained, 5.02
 confused with argument, 5.02 (3)
Induction
 as assumption of simplicity, 6.363
 has only psychological foundation, 6.3631 (1) Induction, law of
 not a logical law, 6.31
 not a priori, 6.31
Inference
 is a priori, 5.133
 "Laws of", senseless, 5.132(4)
Internal properties. (See also Formal properties)
 and features, 4.1221
 and inconceivability, 4.123 (1)
 and structure, 4.122 (2)
 knowledge of, needed for knowledge of objects, 2.01231
 of a proposition, describe reality, 4.023 (4)
 of possible states of affairs, 4.124 (1), 4.125
 their holding is shown, 4.122(4)
Internal relations
 and deducibility, 5.131
 and definition of formal series, 4.1252 (1)
 between structures of propositions, 5.2
 equivalent to operations, 5.232
 of statement about a complex to a statement about constituents, 3.24 (1)
 representation as an instance, 4.014 (1)
Internal similarity, 4.0141
"Is," meanings of, 3.323 (2)
Language (See also Ordinary Language)
 able to express every sense, 4.022 (1)
 as supplying intuition, 6.233
 "critique of", 4.0031
 disguises the thought, 4.002 (4)
 is totality of propositions, 4.001
 limits of my, 5.6
 logic of, 4.002 (3), 4.003 (1)
 translation of, 3.343
Law of least action, 6.3211
Laws of nature, not explanations, 6.371
Life, the problem of, 6.52, 6.521
Logic. (See also Logical propositions)
 all is accident outside, 6.3
 all questions of, answerable offhand, 5.551 (1)
 and mechanics, 6.342
 application of, 5.5521, 5.557
 as allembracing, world reflecting, 5.511
 calculation in, 6.121 (1)
 cannot cross limits of world, 5.61 (3)
 deals with possibilities, 2.0121 (3). 5.555 (3)
 every proposition of, its proof, 6.1265
 expedients in, 5.452, 5.511
 impossibility of " contradicting ", 3.033.032, 5.4731
 impossibility of describing the world in, 5.61 (2)
 irrelevance of monism and dualism to, 4.128 (2)
 is a priori, 5.4541 (2), 5.4731, 5.551 (1)
 is transcendental, 6.13 (2)
 its propositions are tautologies, 6.1, 6.22
 laws of, do not obey further laws, 6.123 (1)
 must take care of itself, 5.454 (1)
 no classification in, 5.454 (1)
 no mistakes possible in, 5.473 (3)
 no numbers in, 5.453 (2)
 no primitive propositions in, 6.127 (1)
 no surprises in, 6.1251
 not a natural science, 6.111
 not a theory, 6.13 (1)
 nothing accidental in, 2.012
 of constituents, shown by tautologies, 6.12 (2)
 of facts, cannot be represented, 4.0312 (2)
 possibility in, 5.473 (2)
 precedes every experience, 5.552 (2)
 "primitive propositions " of, arbitrary in number, 6.1271
 problems of, concrete, (2)
 process and result equivalent in, 6.1261
 proof in, 6.126 (24), 6.1262
 propositions of, say nothing, 5.43 (2)
 reflects the world, 6.13 (1)
 role of postulation in, 6.1223
 searches for regularity, 6.3
 simplicity of, 5.4541
 whole philosophy of, 6.113
 why called theory of forms, 6.1224
 "zeromethod" in, 6.121 (2)
Logical, equated with formal, 6.12 (1)
Logical constants
 disappearance of, 5.441
 do not represent, 4.0312 (2)
 only one of them, 5.47 (4),
 there are none, 5.4
Logical coordinates, as determining logical place, 3.41
Logical forms, are anumerical, 4.128 (1)
Logical grammar, 3.325 (1) (See also Logical syntax)
"Logical objects", there are no, 4.441, 5.4
Logical place (See also Logical space)
 denial as determining, 4.0641
 proposition determines one, 42 (1)
 relation to propositional sign and logical coordinates, 3.41
Logical properties of propositions, demonstrated by producing tautologies, 6.121
Logical propositions
 as forms of a proof, 6.1264 (1)
 as modus ponens, 6.1264 (2)
 connection with the world of, 6.124
 dispensable, 6.122
 have a peculiar place among all propositions, 6.112
 have equal rank, 6.127 (1)
 not confirmable by experience, 6.1222
 not distinguished by generality, 6.1231 (1)
 present the scaffolding of the world, 6.124
 their truth discernible in the symbol, 6.113
 "treat" of nothing, 6.124
Logical space {See also Logical place)
 and the world, 1.13
 everything is in, 2.013
 facts in, 1.13
 given with every proposition, 3.42 (1)
 pictures present facts in, 2.11, 2.202
 place in, determined by proposition, 3.4
Logical syntax
 and rules of translation, 3.344
 implies all logical propositions, 6.124
 meanings of signs plays no role in. 3.33
 need for obeying, 3.325 (1)
 rules of, 3.334
Mathematics
 has no need for theory of classes, 6.031 (1)
 intuition in, place of, 6.233
 is a logical method 6.2 (1), 6.234
Mathematics — continued
 method of, working with equations, 6.234 (1)
 no accidental generality in, 6.031 (2)
 proof in, significance of, 6.232 (1)
 propositions of
 all selfevident, 6.234 (1)
 are equations, 6.2 (2)
 as links in inference, 6.211
 express no thoughts, 6.21
 show logic of the world, 6.22
 uses method of substitution, 6.24 (1)
Mauthner, 4.0031
Mechanics
 its generality, 6.3432
 nature of, 6.343
 relation to logic, 6.342
Microcosm, the, 5.63
Meaning
 of names, 3.3
 of primitive signs, 3.263
Modus Ponens, 6.1264 (2)
Multiplicity
 and number of dimensions of signs, 5.474
 and symbol for generality, 4.0411 (3)
 cannot be represented, 4.04 (1)
 the same in the proposition and the state of affairs represented, 4.04
Mystical, the, 6.44, 6.45, 6.522
Names
 are primitive signs, 3.26
 are simple signs, 3.202
 are simple symbols, 4.24 (1)
 are unanalysable, 3.26
 cannot be defined, 3.261 (2)
 cannot express sense, 3.142
 dispensable in describing the world, 5.526
 elementary proposition a connexion of 4.22
 have meaning only in context of proposition, 3.3
 how they occur in propositions, 4.23
 index of, 5.02 (i)
 no composition essential, 3.3411
 resemble points, 3.144 (2)
 the " real ", 33411
 variable, 3.314 (2)
Natural sciences
 are the totality of true propositions, 4. i (1)
 do not include philosophy, 4.111
Necessity: only logical necessity, 6.37
Negation (See Denial)
Negation (= Simultaneous denial)
 introduced, 5.5
 symbolized, 5.502
Newtonian mechanics, 6.341, 6.342 (2)
Nonsense (Unsinn)
 examples of, 5.5303, 5.5351 (2)
 impossible to judge, 5. 5422
Nonsensical, logical propositions not, 4.461 (1)
Notation (See also Language)
 arbitrariness of, 3.342
 essence of, 3.342
 "Number", a formal concept, 4.1272 (7, 8)
Number
 concept of, 6.022
 concept of equality of, 6.1022 (3)
 general form of, 6.022 (1), 6.03
Numbers
 as exponents of operation, 6.021
 definitions of, 6.02
 ordered by internal relation, 4.1252 (2)
"Object", a pseudoconcept, 4.1272 (1)
Objects and possibility, 2.014
 are colourless, 2.0232
 are referred to by names, 3.203, 3.22
 are simple, 2.02
 are substance of world, 2.021
 are the fixed form of the world, 2.023, 2.026
 as determining bounds of empirical reality, 5.5561 (1)
 can only be named, 3.221
 cannot be asserted, 3.221
 common characteristics of, not
 shown by similarity of signs, 3.322
 configuration of, 3.21
 form of, 2.0141
 if given, all are given, 5.524 (1)
 independence of, 2.0122
 occurrence in atomic facts of, 2.0122.0123
 possible infinity of, 4.2211
 possibility of connexion with other objects, 2.0121 (4)
 senseless to speak of their existence, 4.1272 (5)
 senseless to speak of their number, 4.1272 (6)
Obviousness, and deducibility,
Occam's razor, 3.328, 5.47321 (1)
Operations
 assert nothing, 5.25 (2)
 basis of, 5.21, 5.24 (3), 5.25 (2), 5.251
 can cancel out, 5.253, 5.254
 characterize difference in forms, 5.24 (a), 5.241
 connexion with structure, 5.22, 6.002
 defined, 5.23
 depend upon formal properties, 5.231
 distinct from functions, 5.25 (3)
 examples of, 5.2341 (2)
 exponent of, 6.021
 not relations, 5.42 (1)
 number of basic, depends only on our notation, 5.474
 occurrence of, does not characterize sense, 5.25 (1)
 result of, can be basis of same operations, 5.251
 shown in a variable, 5.24 (1)
 signs for, are punctuations, 5.4611
 successive application of, 5.2521, 5.2523
Ordinary language
 all its propositions completely in order, 5.5563
 ambiguity of, 3.323
 as complicated as the human organism, 4.002 (2)
 needs complicated adjustments, 4.002 (5)
Philosophy
 an activity, not a theory, 4.112 (2)
 and the Darwinian theory, 4.1122
 danger of confusion with psychology, 4.1121 (3)
 demarcates natural science, 4.113
 demarcates the thinkable, 4.114
 displays the speakable, 4.115
 importance of possibility in, 3.421
 in no special relation to psychology, 4. 1121 (1)
 is full of confusions, 3.324
 its object the logical clarification of thoughts, 4.112 (1)
 makes propositions clear, 4.112 (4)
 mostly consists of senseless statements, 4.003
 not a natural science, 4.111
 results in elucidations, 4.112(3) Philosophy — continued
 right method of, 6.53
 value of questions about purpose of symbolism in, 6.211 (1)
Physical laws, refer to obejcts of the world, 6.3431
Pictures
 and logical space, 2.1 1
 are compared with reality, 2.223
 are facts, 2.14, 2.141
 are models of reality, 2.12, 4.01
 form of representation of, 2.15
 have form of representation in common with reality, 2.16, 2.171
 how linked with reality, 2.151, 2.1511, 2.201, 2.21
 include representing relation, 2.1513
 logical
 are thoughts, 3.
 propositions as, 4.03 (3)
 the term defined, 2. 181
 made by us, 2.1
 none a priori true, 2.224, 2.225
 possibility of, requires substance, 2.0212
 propositions are, 4.012
 propositions as, of reality, 4.021
 represent their sense, 2.221
Possibility, 2.01223
 and conceivability, 3.02
 and form of representation, 2.151
 and logic, 2.0121 (3), 5.473 (2)
 and logical place, 3.411
 and nature of the world, 3.3421
 of atomic facts, 2.012, 2.0124
 of connexion of things, 2.0121 (4)
 of method of symbolizing, 2.3421
 of projection, 3.13 (2)
 of propositions, 4.0312 (1)
 of states of affairs, 2.014, 2.202, 2.203
 how shown, 5.525 (2)
 of structure is form, 2.033
"Postulation" of "logical truths", 6.1223
Primitive ideas, formal concepts as, 4.12721
Primitive signs
 how their meanings are elucidated, 3.263
 names are, 3.26
 of logic
 as forms of combination, 5.46
 need to be justified, 5.45
 rules of definition apply to, 5.451 (2)
 signify differently from nonprimitive signs, 3.261 (2)
Principles, scientific, as a priori intuitions, 6.34
Probability
 based on series of truthfunctions, 5.1
 does not apply to isolated propositions, 5.153
 has certainty as a limiting case of, 5.152 (3)
 involves general description of propositional form, 5.156 (2)
 is a generalization, 5.156 (1)
 measure of, defined, 5.15, 5151
 needed in default of certainty, 5.156 (2)
 of elementary propositions, 5.152 (2)
 proposition
 an extract from other proposition,s 5.156 (5)
 has no special object, 5.1511
 relation of experience to, 5.154(4)
 relation to certainty, possibility, impossibility, 4.464 (2)
 unit of, 5.155
Problems, the deepest, are no problems, 4.003 (3)
Projection
 and translation, 4.0141
 method of, as thought, 3.11 (2)
 possibility of, belongs to proposition, 3.13 (2)
Proof
 in logic, a mechanical expedient, 6.1263
 of significant proposition contrasted with proof in logic, 6.1263
 of twice two, 6.241
Propositional connexion {Satzverband), 4.221
Propositional sign
 as determining logical place, 3.41
 cannot contain itself, 3. 332
 defined, 3.12
 elements of, 3.2
 essential nature of, 3.1431 (1)
 is a fact, 3.14, 3.143
 relation of, to proposition, 3.12
 sense of, needs no explanation, 4.02, 4.021
 truth table as, 4.44, 4.442 (1)
Propositional variable
 bar symbol for, 5.501
 defined, 3.313 (3)
 determination of values of, 3.316
 expresses a formal concept, 4.126 (8)
 every variable conceivable as, 3.314
 relation to logical form, 3.315
Propositions
 accidental features of, 3.34
 about complexes, 3.24
 all of equal value, 6.4
 always complete pictures, 5.156 (4)
 analysis of, 3.201, 3.25, 4.221 (1)
 and truth possibilities of elementary prepositions, 4.4
 are articulated, 3.141 (2), 3.251, 4.032 (1)
 are compared with reality, 4.05
 are composite, 4.032 (2), 5.5261 (1)
 are descriptions of facts, 4.023 (3)
 are expressions, 3.31 (2)
 are expressions of their truth conditions, 4.431 (2)
 are generalizations of elementary propositions, 4.52
 are pictures of reality, 4.021
 are truthfunctions of elementary propositions, 5(1)
 as configurations of objects, 2.0231
 as functions of expressions, 3.318
 as logical pictures, 4.01 (1), 4.03 (3)
 as models of reality, 4.01 (2)
 can say nothing about themselves, 3.332
 cannot assert their own truth, 4.442 (3)
 cannot be given sense by assertion, 4.064
 cannot represent logical form, 4.12 (1), 4.121
 completely generalized, 5.526 (1), 5.5261 (1)
 content of, 3.13 (4)
 denial of, 4.0641
 determine one logical place each, 3.42
 elementary
 are trutharguments of proposition, 5.01
 assignment of truthvalues to, describes the world, 4.26
 cannot be given a priori, 5.5571
Propositions — continued

 cannot contradict other elementary propositions, 4.211
 composition of, cannot be given, 5.55 (2)
 concept of, 5.555 (1)
 consist of names, 4.22, 5.55 (2)
 contain all logical operations, 5.47 (2)
 forms of, no hierarchy of, 5.556
 if given, all are given, 5.524 (2)
 importance of, for understanding other propositions, 4.411
 how symbolized, 4.24 (2, 3)
 logically independent, 5.134
 possible forms of, 5.55
 purely logical grounds for there being, 5.5562
 range allowed by, 5.5262 (1)
 relation of truth possibilities of, to other propositions, 4.4
 relation to atomic facts, 4.21, 4.25
 relation to tautology and contradiction, 6.3751(3)
 essential features of, 3.34
expression of thoughts in, 3.2
 follow from elementary propositions, 4.52
 general form of, 5.47 (5)
 have elementary propositions as trutharguments, 5.01
 have sense independent of facts, 4.061
 have truthvalue because pictures of reality, 4.06
 how understood, 4.024
 in them names stand for objects, 3.22
 logical (See Logical propositions)
 logical form of, 4.0031
 most general form of, 4.5, 6
 need only 'yes' or 'no' to fix reality, 4.023 (1)
 neither probable nor improbable in themselves, 5.153
 number of possibilities of agreement with truthpossibilities of elementary propositions, 4.42, 4.45 (1)
 opposition of, 5.513 (2)
 present existence and nonexistence of atomic facts, 4.1
 presuppositions of, 5.5151 (3)
"primitive", 5.43 (1) probability, have no special object, 5.1511
 psychological, 5.541, 5.542
 reach through whole logical space, 3.42 (3)
 relation of, to propositional sign, 3.12
 resemble arrows, 3.144 (2)
 say how, not what a thing is, 3.221
 sense of, unchanged by adjoining tautology, 4.465
 show their sense, 4.022
 show what they say, 4.461 (1)
 significant
 are thoughts, 4
 content of, 3.13 (4, 5)
 what is common to, illustrated, 5.513 (1)
 what they say, 4.022 (2)
 what logical space given with, 3.42 (1)
Prototype
 and logical form, 3.315
 and symbolism for generality, 5.522
 and variable, 3.315
 examples of, 3.333 (1), 5.5351 (1)
 in notation for generality, 3.24 (3), 5.522
Pseudoconcept, 4.1272 (1)
 proposition and thing as, 5.5351 (1)
Pseudopropositions, 5.535 (1)
 arising from use of pseudoconcepts, 4.1272 (4)
 mathematical propositions are, 6.2 (2)
Psychology, and philosophy, 4.1121
Range, defined, 4.463
Reality
 as existence of atomic facts, 2.06 (1)
 completely described by proposition, 4.023 (2)
 described by internal properties of proposition, 4.023 (4)
 empirical, bounded by totality of objects, 5.5561 (1)
 form of, 2.18
 how linked to pictures, 2.15112.15121
 logical features of, 4.023 (5)
 not pictured by tautology or contradiction, 4.462
 pictures are models of, 2.12
 pictures compared with, 2.21, 2.223
 proposition as picture of, 4.01 (1), 4.021
 propositions are compared with, 4.05
 total, is the world, 2.063
Representation, logic of, 4.015 (See also Form of representation)
Representing relation, belongs to the picture, 2.1513
Right and left hand, Kantian problem of, 6.361 11
Rules, as equivalent to symbols, 5.514
Russell, 3.318, 3.325, 3.331, 3.333, 4.0031, 4.12721, 4.1272 (8), 4.1273, 4.241 (3), 5.02 (2), 5.132 (4), 5.252, 5.4, 5.42, 5.452 (2), 5.513 (3), 5.521, 5.525. 5.5302, 5.535, 5.541 (4), 5.5422, 5.553 (1), 6.123 (2), 6.1232
Russell's paradox, 3.333 (4)
Saying
 by propositions, 4.022 (2)
 impossibility of, what we cannot think, 5.61 (4)
Scaffolding, logical, 3.42 (3), 4.023 (5), 6.124
Scepticism, 6.51 (1)
Selfevidence (See also Obviousness)
 how discarded in logic, 5.4731
 not a criterion of logical propositions, 6. 1 271
 of mathematical propositions, 6.2341
Sense
 and deducibility, 5.122
 cannot be supplied by assertion, 4.064
 characterized by expressions, 3.31 (1)
 connexion with method of projection, 3. 11 (2)
 equated with representation of state of affairs, 4.031 (2)
 expressible only by facts, 3.142
 new, how communicated, 403 (1)
 objects occurring in, 4.1211 (1)
 of propositional sign, needs no explanation, 4.02, 4.021
 of propositions
 and possibilities of existence of atomic facts, 4.2
 contained in sense of other propositions, 5.122
 expressed by spatial position, 3.1431 (2)
 form only of, contained in proposition, 3.13 (4)
Sense — continued

 how determined, 4.063 (2)
 independent of facts, 4.061 (1)
 of truthfunctions as a function, 5.2341 (i)
 only propositions have it, 3.3
 opposite, 4.0621 (3)
 postulate of determinateness of, 3 23
 requires substance, 2.021 1
 reversed by denial, 5.2341 (3)
 what a picture represents is its, 2.221
Senseless (Sinnlos)
 distinct from nonsensical, 4.461 (3), 4.4611
 examples of the, 4.1272 (9), 4.1274, 5.1362 (2)
 "laws of inference" are, 5.132 (4)
 tautology and contradiction are, 4.461 (3)
Series, formal {See Formal series)
Showing
 by tautologies and contradictions, 4.461 (1)
 by structure, 4.1211 (2)
 correctness of solipsism, 5.62 (2)
 examples of, 4.1211, 6.12, 6.1201, 6.127 (2), 6.36 (2)
 excludes saying, 4. 1212
 generality, 5.1311 (2)
 logic of the world, 6.22
 logical form, 4. 121 (4)
 needed for form of representation, 2.172
 of operations, 5.24 (i)
 of sense, 4,022
 that a formal concept applies, 4.126 (3)
 that internal properties hold, 4.122 (4)
 that one proposition follows
 from another, 4.1 211 (2)
 that the world is my world, 5.62 (3)
 the inexpressible, 6.522
 what it says, by proposition, 4.461 (1)
Sight, field of, 5.633, 5.6331
Sign
 and symbol, 3.326
 application of, 3.262
 as likeness of the signified, 4.012
 as perceptible part of symbol, 3.12 3.32
 cannot receive a wrong sense, 5.4732
 complex, 3.1432
 equivalence of, 5.47321 (2)
 how it determines a logical form, 3.327
 identity of tokens of, 3.203
 possible, 5.473 (2)
 primitive (See Primitive signs)
 propositional (See Propositional sign)
 simple, 3.201, 3.202
 the same, may belong to different symbols, 3.321
 unused, 3.328 (1)
Similes, 4.015
Simplicity of objects, 2.02, 2.021
"Socrates is identical", 5.473 (2), 5.4733 (3)
Solipsism
 coincides with realism, 5.64
 correct in intention, 5.62
Soul, 5.5421 {See also Subject)
Space
 a form of objects, 2.0251
 congruence in, 6.36111
 geometrical figures cannot contradict laws of, 3.032
 logical (See Logical space)
 spatial objects must lie in, 2.0131 (1)
 spatial objects unthinkable apart from, 2.0121 (4)
 symmetry in, 6.3611 (3)
 visual, 2.0131 (2)
"Spatial spectacles", 4.0412
States of affairs (Sachlage)
 can be described, not named, 3.144 (i)
 connexion of object with, 2.0122
 possibility of, 2.014
Structure
 and form, 2.033
 and internal property, 4.122(2)
 connexion with operation, 5.22
 logical, 4.014 (2)
 logical relations shown by, 4.1211 (2)
 of a picture, 2.15 (2)
 of atomic fact, 2.032, 2.034
 of propositions, and deducibility, 5.13
 of propositions, stand in internal relations, 5.2
 properties of, and tautology, 6.12 (3)
Subject, the
 and the body, 5.631 (2)
 does not belong to the world, 5.632
 is a limit of the world, 5.632, 5.641 (3)
 no such thing exists, 5.542 (1), 5.631 (1)
Substance
 of the world, identified with objects, 2.021
 exists independently of what is the case, 2.024
 is form and content, 2.025
Successor, definition of, 4.1252(4)
Superstition, 5.1361 (2)
Symbolizing, methods of, 3.322
Symbols
 and signs, 3.326
 as equivalent to rules, 5.541
 composite, criterion of, 5.5261 (2)
 difference of, 3.323 (3)
 different, may have common sign, 3.321
 equated with expressions, 3.31
 essential features of, 3.34
 for complexes, how defined, 3.24 (4)
 have sign for perceptible part, 3.32
 presuppositions of, 5.5151 (3)
 what signifies in, 3.344
Tautology
 a limiting case of combinations of symbols, 4.466 (4)
 an ungeneralized proposition can be, 6.1231 (2)
 and properties of structure, 6.12 (3)
 as showing logic of the world, 6.22
 defined, 4.46 (4)
 derivation of tautology from, 6.126 (3)
 effect of adjoining, to a proposition, 4.465
 follows from all propositions, 5.142
 has no truth conditions, 5.461 (2)
 how used in demonstrating logical properties, 6. 121
 is analytical proposition, 6. 11
 is without sense, 4.461 (3)
 its truth certain, 4.464 (1)
 logical proposition is, 6.1
 method for recognizing, 6.1203
 not a picture of reality, 4.462
 not nonsensical, 4.4611
 probability of, 5.152 (4)
 says nothing, 4.461 (1), 5.142, 6.11
 shared by propositions, 5.143 (1)
 shows that it is a tautology, 6.127 (2)
Theory of knowledge, how related to psychology and philosophy, 4.1121 (2)
Theory of types, 3.33i3.333, 5.252, 6.123 (2)
Things (See Objects)
Thinkable
 and picturable, 3.001
 and possible, 3.02
 is demarcated by philosophy, 4.114
 only uniform connexions are, 6.361
Thought
 a priori, criterion of, 3.04
 as a logical picture, 3
 as method of projection, 3.11 (2)
 contains possibility of a state of affairs, 3.02 (1)
 disguised by language, 4.002(4)
 expressed by signs, 3.1
 form of, 4.002 (4)
 how expressed in propositions, 3.2
 is applied propositional sign, 3.5
 is the significant proposition, 4
Time
 a form of objects, 2.0251
 "passage" of, 6.3611 (i)
 sequence of events in, 6.3611 (1, 2)
 temporal objects unthinkable apart from, 2.0121 (4)
Totality of atomic facts, 2.05
Translation
 and projection, 4.0141
 as criterion for "what is common" to symbols, 3.343
Truth
 and falsity, not coordinate relations, 4.061
 concept of, explained, 4.063
 concept of, Frege's account false, 4.431 (3)
 its connexion with pictorial nature of proposition, 4.06
 not a property, 6.111
Trutharguments, elementary propositions are, 5.01
Truthconditions
 groups of, can be ordered in a series, 4.45
 how expressed, 4.442 (4)
 of propositions, and truth possibilities of elementary propositions, 4.41
 symbolism for, 4.43
 relation to truthpossibilities, 4.431 (1)
Truthfunctions
 and truthoperations, 5.3 (2, 3)
 are results of operations, 5.234
 can be ordered in series, 5.1 (1)
 general form of, 6 (1)
 not material functions, 5.44 (1)
 notations for, 3.3441
 of two variables, itemized, 5.101 (1)
 result from application of simultaneous denial, 5.5 (1)
 the term introduced, 5.
Truthgrounds
 and deducibility, 5.11, 5.12, 5.121
 as measure of probability, 5.15, 5.151
 defined, 5.101 (2)
Truthoperations
 and truthfunctions, 5.3 (2, 3)
 defined, 5.234
Truthpossibilities
 defined, 4.3
 of combinations of elementary propositions, 4.28
 schemata for, 4.31
Understanding
 depends on understanding elementary propositions, 4.411
 of general propositions depends on understanding elementary propositions, 4.411
 of names, 4.243
 of propositions, 4.02, 4.024 INDEX
 of synonyms, 4.243
Unspeakable, the, and philosophy, 4. 1 15
Value, 6.4, 6.41
Variable {See also Propositional variable)
 an expression presented by, 3.313
 is sign of formal concepts, 4.1271
 can be regarded as propositional variable, 3.314
 determination of values of, 3.317
 form of, 4.1271 (2)
 general propositional, 5.242
 general propositional form is a, 4.53
 in expression of general term of series, 5.2522
 names, as sign for pseudoconcept, object, 4.1272 (1)
 name, can be conceived as propositional variable, 3.314 (2)
 needed for expressing general term of formal series, 4.1273 (1)
 propositional {See Propositional variable)
 used for operations, 5.24 (1)
 values of, 3.315, 5.501 (6)
Whitehead, 5.452 (2), 5.252
Will, the, 6.423, 6.43
Words, cannot occur both in and out of propositions, 2.0122
World, my
 I am, 5.63
 limits of, 5.62 (3)
World, the
 and life are one, 5.621
 and logical space, 1.13
 and what is the case, 1
 completely described by totality of true elementary propositions, 4.26
 composed of facts, not things, 1.1
 connexion with logical propositions, 6.124
 divides into facts, 1.2
 independent of my will, 6.373, 6.374
 information about, given by simplicity of description, 6.342 (2)
 is total reality, 2.063
 is totality of atomic facts, 2.04
 its form consists of objects, 2.023
 limits of, 5.61 (i)
 logic of, shown in tautologies and equations, 6.22
 logical properties of, 6.12, 6.124
 names not needed for description of, 5.526
 nature of, revealed by possibility, 3.3421
 objects its substance, 2.021
 projective relation of propositional sign to, 3.12
 sense of, 6.41 (i)
 the subject does not belong to it, 5.632
"Zeromethod", in logic, 6.121 (2)
 ↑ The Editor is indebted to Professor Max Black for providing this Index, which was originally prepared for the use of his students at Cornell University.