Page "Edmund Husserl" Paragraph 58

1.

The first prejudice is the supposition that logic is somehow normative in nature.

Husserl argues that logic is theoretical, i. e., that logic itself proposes a priori laws which are themselves the basis of the normative side of logic.

Since mathematics is related to logic, he cites an example from mathematics: If we have a formula like ( a + b )( a-b )= a²-b² it does not tell us how to think mathematically.

It just expresses a truth.

A proposition that says: " The product of the sum and the difference of a and b should give us the difference of the squares of a and b " does express a normative proposition, but this normative statement is based on the theoretical statement "( a + b )( a-b )= a²-b² ".