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Theorem equsexOLD 2003
 Description: Obsolete proof of equsex 2002 as of 6-Feb-2018. (Contributed by NM, 5-Aug-1993.) (Revised by Mario Carneiro, 3-Oct-2016.) (New usage is discouraged.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
equsex.1
equsex.2
Assertion
Ref Expression
equsexOLD

Proof of Theorem equsexOLD
StepHypRef Expression
1 exnal 1583 . 2
2 df-an 361 . . 3
32exbii 1592 . 2
4 equsex.1 . . . . 5
54nfn 1811 . . . 4
6 equsex.2 . . . . 5
76notbid 286 . . . 4
85, 7equsal 1999 . . 3
98con2bii 323 . 2
101, 3, 93bitr4i 269 1
 Colors of variables: wff set class Syntax hints:   wn 3   wi 4   wb 177   wa 359  wal 1549  wex 1550  wnf 1553 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-6 1744  ax-11 1761  ax-12 1950 This theorem depends on definitions:  df-bi 178  df-an 361  df-tru 1328  df-ex 1551  df-nf 1554
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