Theorem ax13dgen4OLD 2018

Description: Obsolete proof of ax13dgen4 2017 as of 10-Oct-2021. (Contributed by NM, 13-Apr-2017.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
ax13dgen4OLD	|- ( -. x = x -> ( x = x -> A. x x = x ) )

Proof of Theorem ax13dgen4OLD

Step	Hyp	Ref	Expression
1		ax13dgen1 2014	1 |- ( -. x = x -> ( x = x -> A. x x = x ) )

Syntax hints:   -. wn 3   -> wi 4   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

This theorem depends on definitions:  df-bi 197  df-ex 1705

This theorem is referenced by: (None)