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Step * 1 of Lemma mul-associates

.....assertion..... 
∀x,y,z:ℤ.  (((x * y) * z) = (x * y * z) ∈ ℤ)
BY
{ TACTIC:((UnivCD THENA Auto) THEN Refine_multiplyAssociative 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\_multiplyAssociative  THEN  Fold  `member`  0  THEN  Declaration)

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