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Step * of Lemma nat-weak-overt

wOvert(ℕ)
BY
{ TACTIC:(D 0 THEN Auto) }

1
1. [Y] : Type
⊢ ∃f:Open(ℕ × Y) ⟶ Open(Y). ∀A:Open(ℕ × Y). ∀y:Y.  (y ∈ f A ⇐⇒ ¬¬(∃x:ℕ. <x, y> ∈ A))

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Latex:

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Latex:
wOvert(\mBbbN{})


By

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Latex:
TACTIC:(D  0  THEN  Auto)

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