Theorem r19.23vOLD 2938

Description: Obsolete proof of r19.23v 2937 as of 12-Jan-2020. (Contributed by NM, 31-Aug-1999.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
r19.23vOLD

Distinct variable group:   ,

Proof of Theorem r19.23vOLD

Step	Hyp	Ref	Expression
1		nfv 1707	. 2
2	1	r19.23 2936	1

Syntax hints:  ->wi 4  <->wb 184  A.wral 2807  E.wrex 2808

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-10 1837  ax-12 1854

This theorem depends on definitions:  df-bi 185  df-an 371  df-ex 1613  df-nf 1617  df-ral 2812  df-rex 2813