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## Main Question or Discussion Point

Hi everyone! In this period i'm trying to understand how proofs work.

And i don't understand why the induction process is only used sometimes. When can i use it ?

For example in the euclid's theorem http://en.wikipedia.org/wiki/Euclid's_theorem

why this could not be proven with the induction ?

And i don't understand why the induction process is only used sometimes. When can i use it ?

For example in the euclid's theorem http://en.wikipedia.org/wiki/Euclid's_theorem

why this could not be proven with the induction ?