Theorem dfral2OLD 2907

Description: Obsolete proof of dfral2 2904 as of 9-Dec-2019. (Contributed by NM, 21-Jan-1997.) (Proof modification is discouraged.) (New usage is discouraged.)

Assertion

Ref	Expression
dfral2OLD

Proof of Theorem dfral2OLD

Step	Hyp	Ref	Expression
1		rexnal 2905	. 2
2	1	con2bii 332	1

Syntax hints:  -.wn 3  <->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

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