Antiquity (325 BCE)
Euclid:

Euclid proves that there are an Infinite number of  Prime numbers. (Primes are only divisible by themselves and one.)

• Proof by contradiction.

Father and Son: Story of Infinity

Euclid does other cool stuff, like developing the axioms of geometry.

Greatest Common Divisor algorithm, still used in RSA (Public Key Cryptography)

Writes the first math text book, much like the style of today, not very readable.

Shown above trying to square the circle, (impossible with ruler and compass).

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