Theorem r19.29af 2616

Description: A commonly used pattern based on r19.29 2612. (Contributed by Thierry Arnoux, 29-Nov-2017.)

Hypotheses

Ref	Expression
r19.29af.0	|- F/ x ph
r19.29af.1	|- ( ( ( ph /\ x e. A ) /\ ps ) -> ch )
r19.29af.2	|- ( ph -> E. x e. A ps )

Assertion

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

Distinct variable group:   ch, x

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

Proof of Theorem r19.29af

Step	Hyp	Ref	Expression
1		r19.29af.0	. 2 |- F/ x ph
2		nfv 1526	. 2 |- F/ x ch
3		r19.29af.1	. 2 |- ( ( ( ph /\ x e. A ) /\ ps ) -> ch )
4		r19.29af.2	. 2 |- ( ph -> E. x e. A ps )
5	1, 2, 3, 4	r19.29af2 2615	1 |- ( ph -> ch )

Syntax hints:   -> wi 4   /\ wa 104   F/wnf 1458   e. wcel 2146   E.wrex 2454

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1445  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-4 1508  ax-17 1524  ax-ial 1532  ax-i5r 1533

This theorem depends on definitions:  df-bi 117  df-tru 1356  df-nf 1459  df-ral 2458  df-rex 2459

This theorem is referenced by:  r19.29an  2617  r19.29a  2618  suplocsrlem  7782  supinfneg  9566  infsupneg  9567  pw1nct  14293