let kCat = ../Category/Cat/semigroupal

let vObject = Type

in  λ(object : Kind) →
    λ(cat : ../Category/Monoidal/Kind kCat vObject object) →
    λ(m : object) →
    λ(field : ./Type object cat m) →
        { additive = field.additive
        , multiplicative =
            ../Group/Commutative/extractCommutativeMonoid
              object
              cat
              m
              field.multiplicative
        }
      : ../Ring/Commutative/Type object cat m