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Step * 1 1 of Lemma fo-logic-test1


9. ∀x.(B x) ⇒ (C x)@i
10. ∃x.B x@i
⊢ ∃x.C x
BY
{ FOExistsElim (-1) }

1
9. ∀x.(B x) ⇒ (C x)@i
10. x : Dom@i
11. B x@i
⊢ ∃x.C x

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Latex:



9.  \mforall{}x.(B  x)  {}\mRightarrow{}  (C  x)@i
10.  \mexists{}x.B  x@i
\mvdash{}  \mexists{}x.C  x


By

FOExistsElim  (-1)

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