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Step * of Lemma inverse-letters_wf

∀[X:Type]. ∀[a,b:X + X].  (a = -b ∈ ℙ)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[X:Type].  \mforall{}[a,b:X  +  X].    (a  =  -b  \mmember{}  \mBbbP{})


By

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Latex:
ProveWfLemma

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