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Theorem 19.26-3an 1369
Description: Theorem 19.26 of [Margaris] p. 90 with triple conjunction. (Contributed by NM, 13-Sep-2011.)
Assertion
Ref Expression
19.26-3an

Proof of Theorem 19.26-3an
StepHypRef Expression
1 19.26 1367 . . 3
2 19.26 1367 . . . 4
32anbi1i 431 . . 3
41, 3bitri 173 . 2
5 df-3an 886 . . 3
65albii 1356 . 2
7 df-3an 886 . 2
84, 6, 73bitr4i 201 1
Colors of variables: wff set class
Syntax hints:   wa 97   wb 98   w3a 884  wal 1240
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1333  ax-gen 1335
This theorem depends on definitions:  df-bi 110  df-3an 886
This theorem is referenced by:  hb3and  1376
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