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Step * 1 of Lemma absval_nat_plus

.....set predicate..... 
1. x : ℤ
2. ¬(x = 0 ∈ ℤ)
⊢ 0 < |x|
BY
{ (RWO "absval-positive" 0 THEN Auto) }

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Latex:

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Latex:
.....set  predicate..... 
1.  x  :  \mBbbZ{}
2.  \mneg{}(x  =  0)
\mvdash{}  0  <  |x|


By

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Latex:
(RWO  "absval-positive"  0  THEN  Auto)

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