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Theorem pm5.5 231
Description: Theorem *5.5 of [WhiteheadRussell] p. 125. (Contributed by NM, 3-Jan-2005.)
Assertion
Ref Expression
pm5.5

Proof of Theorem pm5.5
StepHypRef Expression
1 biimt 230 . 2
21bicomd 129 1
Colors of variables: wff set class
Syntax hints:   wi 4   wb 98
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  imim21b  241  elabgt  2678  sbceqal  2808  dffun8  4872  indstr2  8322
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