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".
Maths_Challenges / _target / deps / mathlib / src / category_theory / concrete_category / default.lean
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import category_theory.concrete_category.basic import category_theory.concrete_category.bundled import category_theory.concrete_category.bundled_hom import category_theory.concrete_category.unbundled_hom