7c9158a50e
Fixes issue described at https://leanprover.zulipchat.com/#narrow/stream/270676-lean4/topic/Structure.20diamond.20error
10 lines
273 B
Text
10 lines
273 B
Text
class Semigroup (G : Type u) extends Mul G
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class Numeric (α : Type u)
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class Monoid (M : Type u) extends Semigroup M, Numeric M where
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mul_one (m : M) : m * m = m
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class AddMonoid (A : Type u) extends Numeric A
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class Semiring (R : Type u) extends AddMonoid R, Monoid R
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