Step
*
of Lemma
cdrng_is_abdmonoid
∀[r:CDRng]. ((r↓+gp ∈ AbDMon) ∧ (r↓xmn ∈ AbDMon))
BY
{ (xxxIntroxxx
THEN D 0
THEN Unhide
THEN DVar `r'
THEN (InstLemma `rng_plus_comm` [⌜r⌝]⋅ THENA Auto)
THEN Fold `comm` (-1)
THEN RepeatFor 2 (((MemTypeCD THEN Reduce 0 THEN Try (Trivial) THEN Try ((D 1 THEN Trivial))) THENW Auto))
THEN Auto) }
Latex:
Latex:
\mforall{}[r:CDRng]. ((r\mdownarrow{}+gp \mmember{} AbDMon) \mwedge{} (r\mdownarrow{}xmn \mmember{} AbDMon))
By
Latex:
(xxxIntroxxx
THEN D 0
THEN Unhide
THEN DVar `r'
THEN (InstLemma `rng\_plus\_comm` [\mkleeneopen{}r\mkleeneclose{}]\mcdot{} THENA Auto)
THEN Fold `comm` (-1)
THEN RepeatFor 2 (((MemTypeCD THEN Reduce 0 THEN Try (Trivial) THEN Try ((D 1 THEN Trivial)))
THENW Auto
))
THEN Auto)
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