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Step * 1 of Lemma add-associates

.....assertion..... 
∀x,y,z:ℤ.  (((x + y) + z) = (x + y + z) ∈ ℤ)
BY
{ TACTIC:((UnivCD THENA Auto) THEN Refine_addAssociative THEN Fold `member` 0 THEN Declaration) }

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Latex:

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Latex:
.....assertion..... 
\mforall{}x,y,z:\mBbbZ{}.    (((x  +  y)  +  z)  =  (x  +  y  +  z))


By

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Latex:
TACTIC:((UnivCD  THENA  Auto)  THEN  Refine\_addAssociative  THEN  Fold  `member`  0  THEN  Declaration)

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