Commit 2021-08-12 15:02 ee189957
View on Github →feat(algebra/group_with_zero): units.mk0
is a "monoid hom" (#8625)
This PR shows that units.mk0
sends 1
to 1
and x * y
to mk0 x * mk0 y
. So it is a monoid hom, if we ignore the proof fields.