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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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Copyright (c) 2014 Jeremy Avigad. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Jeremy Avigad, Leonardo de Moura, Michael Howes

Various multiplicative and additive structures.
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import algebra.group.to_additive
import algebra.group.basic
import algebra.group.units
import algebra.group.hom
import algebra.group.type_tags
import algebra.group.free_monoid
import algebra.group.conj
import algebra.group.with_one
import algebra.group.anti_hom
import algebra.group.units_hom