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Step * 1 of Lemma all-nsub2


1. [P] : ℕ2 ⟶ ℙ
2. ∀x:ℕ2. P[x]@i
⊢ P[0] ∧ P[1]
BY
{ (D 0 THEN BackThruSomeHyp) }

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Latex:

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Latex:

1.  [P]  :  \mBbbN{}2  {}\mrightarrow{}  \mBbbP{}
2.  \mforall{}x:\mBbbN{}2.  P[x]@i
\mvdash{}  P[0]  \mwedge{}  P[1]


By

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Latex:
(D  0  THEN  BackThruSomeHyp)

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