### 1.2.4.3 Integers

Kronecker once is reputed to have said: " God made the Integers, the rest is made by man"

He did not accept irrational numbers such as or or e.

Kronecker believed that to prove that exists one had to construct it. The usual 'proof by contradiction ' i.e. proving something is true by showing the opposite is unture was rejected.

Kroneckers influence was that he inspired Brouwer.