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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
StepHypRef Expression
1 nfv 1707 . 2
21r19.23 2936 1
Colors of variables: wff setvar class
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
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