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Step * of Lemma fpf_dom_compose_lemma

∀f,g,x,eq:Top.  (x ∈ dom(g o f) ~ x ∈ dom(f))
BY
{ (UnivCD THENA Auto) }

1
1. f : Top@i
2. g : Top@i
3. x : Top@i
4. eq : Top@i
⊢ x ∈ dom(g o f) ~ x ∈ dom(f)

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Latex:

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Latex:
\mforall{}f,g,x,eq:Top.    (x  \mmember{}  dom(g  o  f)  \msim{}  x  \mmember{}  dom(f))


By

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Latex:
(UnivCD  THENA  Auto)

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