[est]

is there a simpler version of LEAN suitable for high school student level math? Sympy?

[deadbeef57]

You might enjoy http://wwwf.imperial.ac.uk/~buzzard/xena/natural_number_game...

It's a game implemented in lean, where you work your way through the basic facts about natural numbers.

[Tainnor]

sympy is not a proof assistant, but a symbolic computer algebra system

[est]

Well I'd say it's enough to automatically solve many high-school level problems, automatically. Like a poor man's Mathematica or WolframAlpha.

[mkl]

Yes, but that's a totally different category of problem from what proof assistants do.