CryptoNerd wrote:
Probably anything that's currently in development, I guess (elliptic curves, functional analysis, knot theory, etc.) It's very hard to say, because "advanced" is a very subjective term that's open to interpretation. Who's to say axiomatic set theory is more "advanced" than high school algebra, for example? By what criteria?
The difficulty can be measured by how hard it is to prove the central theorems and solve the outstanding problems.
I would not venture to introduce a course in Zermelo-Frankel set theory in grade school. In American elementary schools students have a hard enough time with the watered down version of Euclid's Geometry (a subset of Euclid's Elements, Book I). The concept of proof is beyond most school kids and only the ones interested in it go on to advanced mathematics.
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