Proofs that every mathematician should know. [closed]

There are mathematical proofs that have that “wow” factor in being elegant, simplifying one’s view of mathematics, lifting one’s perception into the light of knowledge, etc.

So I’d like to know what mathematical proofs you’ve come across that you think other mathematicans should know, and why.

Answer

Here is my favourite “wow” proof .

Theorem
There exist two positive irrational numbers s,t such that st is rational.
Proof
If 22 is rational, we may take s=t=2 .
If 22 is irrational , we may take s=22 and t=2 since (22)2=(2)2=2.

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