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Theorem equsalOLD 2000
 Description: Obsolete proof of equsal 1999 as of 5-Feb-2018. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 12-Aug-2011.) (Revised by Mario Carneiro, 3-Oct-2016.) (New usage is discouraged.) (Proof modification is discouraged.)
Hypotheses
Ref Expression
equsal.1
equsal.2
Assertion
Ref Expression
equsalOLD

Proof of Theorem equsalOLD
StepHypRef Expression
1 equsal.2 . . . . 5
2 equsal.1 . . . . . 6
3219.3 1791 . . . . 5
41, 3syl6bbr 255 . . . 4
54pm5.74i 237 . . 3
65albii 1575 . 2
72nfri 1778 . . . . 5
87a1d 23 . . . 4
92, 8alrimi 1781 . . 3
10 ax9o 1954 . . 3
119, 10impbii 181 . 2
126, 11bitr4i 244 1
 Colors of variables: wff set class Syntax hints:   wi 4   wb 177  wal 1549  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-ex 1551  df-nf 1554
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