/caterwaul/Group/Commutative/extractGroup

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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, inverse, product } : ../Type object cat m