Theorem r19.29a 2573

Description: A commonly used pattern based on r19.29 2567 (Contributed by Thierry Arnoux, 22-Nov-2017.)

Hypotheses

Ref	Expression
r19.29a.1	|- ( ( ( ph /\ x e. A ) /\ ps ) -> ch )
r19.29a.2	|- ( ph -> E. x e. A ps )

Assertion

Ref	Expression
r19.29a	|- ( ph -> ch )

Distinct variable groups:   ch, x   ph, x

Allowed substitution hints:   ps( x)   A( x)

Proof of Theorem r19.29a

Step	Hyp	Ref	Expression
1		nfv 1508	. 2 |- F/ x ph
2		r19.29a.1	. 2 |- ( ( ( ph /\ x e. A ) /\ ps ) -> ch )
3		r19.29a.2	. 2 |- ( ph -> E. x e. A ps )
4	1, 2, 3	r19.29af 2571	1 |- ( ph -> ch )

Syntax hints:   -> wi 4   /\ wa 103   e. wcel 1480   E.wrex 2415

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1423  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-4 1487  ax-17 1506  ax-ial 1514  ax-i5r 1515

This theorem depends on definitions:  df-bi 116  df-tru 1334  df-nf 1437  df-ral 2419  df-rex 2420

This theorem is referenced by:  cnegexlem3  7932  cnegex  7933  modqmuladdnn0  10134  neitx  12426