[Merged by Bors] - feat(ring_theory/polynomial/homogenous): add a direct_sum.gcomm_monoid
instance
#6825
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This also corrects a stupid typo I made in
direct_sum.comm_ring
which was previously declared aring
!I started out on trying to show:
but I think there's some API missing around
direct_sum
before that becomes easy, so want to punt it to future work, possibly for someone else.