Try doing some basic maths questions in the Lean Theorem Prover. Functions, real numbers, equivalence relations and groups. Click on README.md and then on "Open in CoCalc with one click".
License: APACHE
import meta.expr open tactic run_cmd do l ← mk_local' `l binder_info.default `(ℕ), m ← mk_local' `m binder_info.default `(ℕ), guard $ `(%%l + %%l = 3).has_local_constant l, guard $ bnot $ `(%%l + %%l = 3).has_local_constant m, guard $ `(%%l + %%m = 3).has_local_constant l, guard $ `(%%l + %%m = 3).has_local_constant m