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If we substitute in respectively,

2) |

and describe the resulting functions, respectively, with *(U), (V), (W),* then by *u = (U), v = (V), w = (W)* it is possible to comply with (1). ^{[AU 1]}

For example, we obtain for the first of them:

and this is fulfilled, because we have:

if there exist the following new equations:

3) |

- ↑ Due to the same order of all parts of equations (1), the right-hand sides of the substitution formulas (2) can be multiplied by a common factor, without changing the results.