Were you taught Euclid's proof that there are infinitely many primes?

I remember learning this – probably some college class – definitely not high school. Honestly, when I learned this it seemed obvious, and I was surprised that the prof made such a big thing of it.

Do you think you could have come up with the proof on your own?

No way. But the concept, yes.

Probably, but I don’t specifically remember. I’m having some unpleasant flashbacks to university honors calculus, which was endless proofs.

@LostInParadise what’s the difference between a theorem and a proof?

Theorem is a statement of a mathematical fact that is considered to be useful. For any theorem there are one or more proofs of why it is true.

I think I remember that my high school calculus teacher demonstrated this, informally. The concept seemed obvious, but the proof is absolutely beautiful! And…no, I dont think I could have come up with it on my own.

Yes I was taught this. I also worked with a brilliant financial application called Euclid in the EU marketplace.
I also have gone through all 13 books of Euclid’s Elements. There is a fascinating book done by Oliver Byrne

That book seems interesting, but according to the Amazon reviews labels for “f” and “s” are sometimes interchanged.