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Theorem 19.8aOLD 1802
 Description: Obsolete proof of 19.8a 1801 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 1716 . 2
2 ax-5 1675 . . . . 5
3 ax-12 1798 . . . . 5
4 ax6ev 1716 . . . . . 6
5 exim 1628 . . . . . 6
64, 5mpi 17 . . . . 5
72, 3, 6syl56 34 . . . 4
87equcoms 1739 . . 3
98exlimiv 1693 . 2
101, 9ax-mp 5 1
 Colors of variables: wff setvar class Syntax hints:   wi 4  wal 1372  wex 1591 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1596  ax-4 1607  ax-5 1675  ax-6 1714  ax-7 1734  ax-12 1798 This theorem depends on definitions:  df-bi 185  df-ex 1592 This theorem is referenced by: (None)
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