> Mathematical functions are taught in school. That function composition is associative and every set has an identity function, this is stuff that every high sc

> Mathematical functions are taught in school. That function composition is associative and every set has an identity function, this is stuff that every high school graduate should know. As a haskeller myself I wholeheartedly disagree. I knew nothing of function composition until Haskell. I only heard about functions in high school once my senior year and it was very basic. Admittedly I went to high school in rural Texas. I also never heard about sets, the word I was never used in my high school math classes. > this is stuff that every high school graduate should know. You seem to have a lot of faith in the lowest common denominator of high school graduates and I think it does you a disservice in being able to help others learn these topics. I sense my last paragraph might have sounded a bit... Aggressive? That's not my intention. P.S. I still don't really know what domain and codomain mean :)