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Step * 1 of Lemma mul-distributes

.....assertion..... 
∀x,y,z:ℤ.  ((x * (y + z)) = ((x * y) + (x * z)) ∈ ℤ)
BY
{ TACTIC:((UnivCD THENA Auto) THEN Refine_multiplyDistributive 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)  +  (x  *  z)))


By

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

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