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Mirrors > Home > MPE Home > Th. List > pm4.25  Structured version Unicode version 
Description: Theorem *4.25 of [WhiteheadRussell] p. 117. (Contributed by NM, 3Jan2005.) 
Ref  Expression 

pm4.25 
Step  Hyp  Ref  Expression 

1  oridm 514  . 2  
2  1  bicomi 202  1 
Colors of variables: wff setvar class 
Syntax hints: wb 184 wo 368 
This theorem was proved from axioms: axmp 5 ax1 6 ax2 7 ax3 8 
This theorem depends on definitions: dfbi 185 dfor 370 
This theorem is referenced by: brbtwn2 23879 
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