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Step * 1 1 of Lemma less_than_irreflexivity

.....assertion..... 
1. x : ℤ
2. x < x
⊢ x + (-x) < x + (-x)
BY
{ TACTIC:(BLemma `add-monotonic` THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
1.  x  :  \mBbbZ{}
2.  x  <  x
\mvdash{}  x  +  (-x)  <  x  +  (-x)


By

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Latex:
TACTIC:(BLemma  `add-monotonic`  THEN  Auto)

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