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

pm4.25 
Step  Hyp  Ref  Expression 

1  oridm 502  . 2  
2  1  bicomi 195  1 
Colors of variables: wff set class 
Syntax hints: wb 178 wo 359 
This theorem is referenced by: brbtwn2 23940 srefwref 24465 
This theorem was proved from axioms: ax1 7 ax2 8 ax3 9 axmp 10 
This theorem depends on definitions: dfbi 179 dfor 361 
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