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Theorem nic-idlem1 1451
Description: Lemma for nic-id 1453. (Contributed by Jeff Hoffman, 17-Nov-2007.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
nic-idlem1  |-  ( ( th  -/\  ( ta  -/\  ( ta  -/\  ta )
) )  -/\  (
( ( ph  -/\  ( ch  -/\  ps ) ) 
-/\  th )  -/\  (
( ph  -/\  ( ch 
-/\  ps ) )  -/\  th ) ) )

Proof of Theorem nic-idlem1
StepHypRef Expression
1 nic-ax 1448 . 2  |-  ( (
ph  -/\  ( ch  -/\  ps ) )  -/\  (
( ta  -/\  ( ta  -/\  ta ) ) 
-/\  ( ( ph  -/\ 
ch )  -/\  (
( ph  -/\  ph )  -/\  ( ph  -/\  ph )
) ) ) )
21nic-imp 1450 1  |-  ( ( th  -/\  ( ta  -/\  ( ta  -/\  ta )
) )  -/\  (
( ( ph  -/\  ( ch  -/\  ps ) ) 
-/\  th )  -/\  (
( ph  -/\  ( ch 
-/\  ps ) )  -/\  th ) ) )
Colors of variables: wff set class
Syntax hints:    -/\ wnan 1297
This theorem is referenced by:  nic-id  1453
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 179  df-an 362  df-nan 1298
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