Theorem wl-ax11-lem7 33368

Description: Lemma. (Contributed by Wolf Lammen, 30-Jun-2019.)

Assertion

Ref	Expression
wl-ax11-lem7	|- ( A. x ( -. A. x x = y /\ ph ) <-> ( -. A. x x = y /\ A. x ph ) )

Proof of Theorem wl-ax11-lem7

Step	Hyp	Ref	Expression
1		nfna1 2029	. 2 |- F/ x -. A. x x = y
2	1	19.28 2096	1 |- ( A. x ( -. A. x x = y /\ ph ) <-> ( -. A. x x = y /\ A. x ph ) )

Syntax hints:   -. wn 3   <-> wb 196   /\ wa 384   A.wal 1481

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-10 2019  ax-12 2047

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-ex 1705  df-nf 1710

This theorem is referenced by:  wl-ax11-lem8  33369