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Step * 1 of Lemma mul-commutes

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

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Latex:

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


By

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

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