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Theorem pm2.1 407
Description: Theorem *2.1 of [WhiteheadRussell] p. 101. (Contributed by NM, 3-Jan-2005.) (Proof shortened by Wolf Lammen, 23-Nov-2012.)
Assertion
Ref Expression
pm2.1  |-  ( -. 
ph  \/  ph )

Proof of Theorem pm2.1
StepHypRef Expression
1 id 20 . 2  |-  ( ph  ->  ph )
21imori 403 1  |-  ( -. 
ph  \/  ph )
Colors of variables: wff set class
Syntax hints:   -. wn 3    \/ wo 358
This theorem is referenced by:  rabrsn  3861  lelttric  9164  hashbclem  11684  hiidge0  22583  xrlelttric  24101  nofv  25561  en3lpVD  28709
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 178  df-or 360
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