I was exposed to this aspect of math through proofs, which are sadly given short shrift in K-12 math today. The schools in my hometown used a math curriculum th

I was exposed to this aspect of math through proofs, which are sadly given short shrift in K-12 math today. The schools in my hometown used a math curriculum that actually introduced basic set theory in first grade, and eased us into proofs. High school geometry was all about proofs. First of all, it was a good education. Second, proofs were what made math come alive for me. I have a lot of opinions about K-12 math education. ;-)