English
If a Monoid M satisfies IsMulCommutative, then M is a CommMonoid.
Русский
Если моноид M удовлетворяет условию IsMulCommutative, то M является коммутативным моноидом.
LaTeX
$$$\\\\forall M \\\\[Monoid M\\\\] \\\\forall \\\\text{inst} \\\\,[IsMulCommutative M], \\\\operatorname{CommMonoid} M, \\\\text{with } mul\\_comm$$$
Lean4
@[to_additive]
instance (priority := 100) ofIsMulCommutative {M : Type*} [Monoid M] [IsMulCommutative M] : CommMonoid M where
mul_comm := IsMulCommutative.is_comm.comm