Portal:Philosophy, Psychology and Religion/BC
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![NOT (P AND NOT P)](//upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Logic.svg/50px-Logic.svg.png)
NOT (P AND NOT P)
![NOT (P AND NOT P)](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Logic.svg/50px-Logic.svg.png)
Logic is the study of reasoning, including both its modes and its valid usage.
Logic is the study of reasoning, including both its modes and its valid usage.