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Step * 1 1 of Lemma minus-is-int-iff


1. a : Base
2. -a ∈ ℤ
⊢ 0 ≤ eval -a; 0
BY
{ TACTIC:(Refine_callbyvalueInt THEN Hypothesis) }

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Latex:

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Latex:

1.  a  :  Base
2.  -a  \mmember{}  \mBbbZ{}
\mvdash{}  0  \mleq{}  eval  -a;  0


By

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Latex:
TACTIC:(Refine\_callbyvalueInt  THEN  Hypothesis)

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