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Theorem cleljustALT 2110
Description: Alternate proof of cleljust 2109. (Contributed by NM, 28-Jan-2004.) (Revised by Mario Carneiro, 21-Dec-2016.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
cleljustALT
Distinct variable groups:   ,   ,

Proof of Theorem cleljustALT
StepHypRef Expression
1 nfv 1707 . . 3
2 elequ1 1821 . . 3
31, 2equsex 2038 . 2
43bicomi 202 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184  /\wa 369  E.wex 1612
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-8 1820  ax-10 1837  ax-12 1854  ax-13 1999
This theorem depends on definitions:  df-bi 185  df-an 371  df-ex 1613  df-nf 1617
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