/caterwaul/Group/extractMonoid
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let kCat = ../Category/Cat/semigroupal
let vObject = Type
in λ(object : Kind) →
λ(cat : ../Category/Monoidal/Kind kCat vObject object) →
λ(m : object) →
λ(group : ./Type object cat m) →
group.{ unit, product } : ../Monoid/Type object cat m