**Mathematical rigor** usually refers to the degree to which a mathematical argument (or, more formally, a mathematical
proof) is logically valid and sound.

Mathematical rigor is in the axiomatic approach that pervades each statement of a theory together with its proof.

This allows to realy have a set of useful knowledge about a certain kind of mathematical phenomena.

A **mathematical theory** is a set of **principles** and **consequences of the principles** which allows to organize
the knowledge in a systematic fashion. One of the first examples in the human culture is the euclidean geometry.

A useful science is characterized by its irrestrictable obedience of the rules of logic, not of ethics unfortunately.

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