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Step * of Lemma rng_plus_cancel_l

∀[r:Rng]. ∀[a,b,c:|r|].  b = c ∈ |r| supposing (a +r b) = (a +r c) ∈ |r|
BY
{ ProveSpecializedLemma `grp_op_cancel_l` 1 [parm{i};r↓+gp] (AbReduceC) }

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Latex:

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Latex:
\mforall{}[r:Rng].  \mforall{}[a,b,c:|r|].    b  =  c  supposing  (a  +r  b)  =  (a  +r  c)


By

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Latex:
ProveSpecializedLemma  `grp\_op\_cancel\_l`  1  [parm\{i\};r\mdownarrow{}+gp]  (AbReduceC)

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