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Step * 1 1 of Lemma mul_bounds_1b

.....assertion..... 
1. a : ℕ+
2. b : ℕ+
⊢ a * 0 < a * b
BY
{ (BackThruLemma `mul_preserves_lt` THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
1.  a  :  \mBbbN{}\msupplus{}
2.  b  :  \mBbbN{}\msupplus{}
\mvdash{}  a  *  0  <  a  *  b


By

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Latex:
(BackThruLemma  `mul\_preserves\_lt`  THEN  Auto)

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