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Step * 2 of Lemma minus-is-int-iff


1. a : Base
2. a ∈ ℤ
⊢ -a ∈ ℤ
BY
{ TACTIC:Auto }

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Latex:

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Latex:

1.  a  :  Base
2.  a  \mmember{}  \mBbbZ{}
\mvdash{}  -a  \mmember{}  \mBbbZ{}


By

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Latex:
TACTIC:Auto

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