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Step * 1 1 of Lemma upto_is_nil


1. n : ℕ
⊢ uiff(n ≤ 0;n = 0 ∈ ℤ)
BY
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Latex:

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Latex:

1.  n  :  \mBbbN{}
\mvdash{}  uiff(n  \mleq{}  0;n  =  0)


By

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Latex:
Auto'

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