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Theorem 19.8aOLD 1858
Description: Obsolete proof of 19.8a 1857 as of 8-Dec-2019. (Contributed by NM, 9-Jan-1993.) (Revised by Wolf Lammen, 13-Jan-2018.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
19.8aOLD

Proof of Theorem 19.8aOLD
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 ax6ev 1749 . 2
2 ax-5 1704 . . . . 5
3 ax-12 1854 . . . . 5
4 ax6ev 1749 . . . . . 6
5 exim 1654 . . . . . 6
64, 5mpi 17 . . . . 5
72, 3, 6syl56 34 . . . 4
87equcoms 1795 . . 3
98exlimiv 1722 . 2
101, 9ax-mp 5 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  A.wal 1393  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-12 1854
This theorem depends on definitions:  df-bi 185  df-ex 1613
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