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Step * of Lemma es-interface-conditional-domain-member

∀[Info:Type]. ∀es:EO+(Info). ∀[A:Type]. ∀X,Y:EClass(A). ∀e:E.  (↑e ∈b [X?Y] ⇐⇒ (↑e ∈b X) ∨ (↑e ∈b Y))
BY
{ (InstLemma `es-interface-conditional-domain-iff` [] THEN Trivial) }

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Latex:

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Latex:
\mforall{}[Info:Type]
    \mforall{}es:EO+(Info).  \mforall{}[A:Type].  \mforall{}X,Y:EClass(A).  \mforall{}e:E.    (\muparrow{}e  \mmember{}\msubb{}  [X?Y]  \mLeftarrow{}{}\mRightarrow{}  (\muparrow{}e  \mmember{}\msubb{}  X)  \mvee{}  (\muparrow{}e  \mmember{}\msubb{}  Y))


By

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Latex:
(InstLemma  `es-interface-conditional-domain-iff`  []  THEN  Trivial)

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