Theorem exlimdd 1752

Description: Existential elimination rule of natural deduction. (Contributed by Mario Carneiro, 9-Feb-2017.)

Hypotheses

Ref	Expression
exlimdd.1	|- F/ x ph
exlimdd.2	|- F/ x ch
exlimdd.3	|- ( ph -> E. x ps )
exlimdd.4	|- ( ( ph /\ ps ) -> ch )

Assertion

Ref	Expression
exlimdd	|- ( ph -> ch )

Proof of Theorem exlimdd

Step	Hyp	Ref	Expression
1		exlimdd.3	. 2 |- ( ph -> E. x ps )
2		exlimdd.1	. . 3 |- F/ x ph
3		exlimdd.2	. . 3 |- F/ x ch
4		exlimdd.4	. . . 4 |- ( ( ph /\ ps ) -> ch )
5	4	ex 108	. . 3 |- ( ph -> ( ps -> ch ) )
6	2, 3, 5	exlimd 1488	. 2 |- ( ph -> ( E. x ps -> ch ) )
7	1, 6	mpd 13	1 |- ( ph -> ch )

Syntax hints:   -> wi 4   /\ wa 97   F/wnf 1349   E.wex 1381

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia3 101  ax-5 1336  ax-gen 1338  ax-ie2 1383  ax-4 1400

This theorem depends on definitions:  df-bi 110  df-nf 1350

This theorem is referenced by:  fvmptdf  5258  ovmpt2df  5632  ltexprlemm  6698