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Step * 1 1 of Lemma nat-retractible


∀x:ℕ. (if (x) < (0)  then ⊥  else x = x ∈ ℕ)
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Latex:

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Latex:

\mforall{}x:\mBbbN{}.  (if  (x)  <  (0)    then  \mbot{}    else  x  =  x)


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