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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".

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License: APACHE
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import data.rat.basic tactic

-- prove one and delete the other

theorem some_reciprocal_is_zero : ∃ x : ℚ, 1 / x = 0 :=
begin
  use 0,
  norm_num -- exact dec_trivial would also work
end

--theorem no_reciprocal_is_zero : ¬ (∃ x : ℚ, 1 / x = 0) :=
--begin
--  sorry
--end