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Step * of Lemma vs-grp_inv_assoc

∀[K:Rng]. ∀[vs:VectorSpace(K)]. ∀[a,b:Point(vs)].  ((a + -(a) + b = b ∈ Point(vs)) ∧ (-(a) + a + b = b ∈ Point(vs)))
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Latex:

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Latex:
\mforall{}[K:Rng].  \mforall{}[vs:VectorSpace(K)].  \mforall{}[a,b:Point(vs)].    ((a  +  -(a)  +  b  =  b)  \mwedge{}  (-(a)  +  a  +  b  =  b))


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