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Step * of Lemma tunion-is-image

∀[A:Type]. ∀[B:A ⟶ Type].  (⋃a:A.B[a] ~ Image((a:A × B[a]),(λp.(snd(p)))))
BY
{ (Unfold `tunion` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[A:Type].  \mforall{}[B:A  {}\mrightarrow{}  Type].    (\mcup{}a:A.B[a]  \msim{}  Image((a:A  \mtimes{}  B[a]),(\mlambda{}p.(snd(p)))))


By

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Latex:
(Unfold  `tunion`  0  THEN  Auto)

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