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Step * 1 of Lemma minus-minus

.....assertion..... 
1. x : ℤ
⊢ (--x) = x ∈ ℤ
BY
{ Symmetry }

1
1. x : ℤ
⊢ x = (--x) ∈ ℤ

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Latex:

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Latex:
.....assertion..... 
1.  x  :  \mBbbZ{}
\mvdash{}  (--x)  =  x


By

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Latex:
Symmetry

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