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Theorem ecase23d 1309
 Description: Variation of ecased 1308 with three disjuncts instead of two. (Contributed by NM, 22-Apr-1994.) (Revised by Jim Kingdon, 9-Dec-2017.)
Hypotheses
Ref Expression
ecase23d.1
ecase23d.2
ecase23d.3
Assertion
Ref Expression
ecase23d

Proof of Theorem ecase23d
StepHypRef Expression
1 ecase23d.1 . 2
2 ecase23d.2 . . 3
3 ecase23d.3 . . . 4
4 df-3or 944 . . . 4
53, 4sylib 121 . . 3
62, 5ecased 1308 . 2
71, 6ecased 1308 1
 Colors of variables: wff set class Syntax hints:   wn 3   wi 4   wo 680   w3o 942 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in2 587  ax-io 681 This theorem depends on definitions:  df-bi 116  df-3or 944 This theorem is referenced by:  iseqf1olemklt  10145  xrmaxiflemcl  10900  xrmaxifle  10901  xrmaxiflemab  10902  xrmaxiflemlub  10903  ennnfonelemex  11766
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