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Theorem jaoi2OLD 955
Description: Obsolete proof of jaoi2 954 as of 21-Sep-2018. (Contributed by Alexander van der Vekens, 3-Nov-2017.) (New usage is discouraged.) (Proof modification is discouraged.)
Hypothesis
Ref Expression
jaoi2.1  |-  ( (
ph  \/  ( -.  ph 
/\  ch ) )  ->  ps )
Assertion
Ref Expression
jaoi2OLD  |-  ( (
ph  \/  ch )  ->  ps )

Proof of Theorem jaoi2OLD
StepHypRef Expression
1 exmid 415 . . . 4  |-  ( ph  \/  -.  ph )
2 iba 500 . . . . 5  |-  ( (
ph  \/  -.  ph )  ->  ( ch  <->  ( ch  /\  ( ph  \/  -.  ph ) ) ) )
3 ancom 448 . . . . . 6  |-  ( ( ch  /\  ( ph  \/  -.  ph ) )  <-> 
( ( ph  \/  -.  ph )  /\  ch ) )
4 andir 858 . . . . . 6  |-  ( ( ( ph  \/  -.  ph )  /\  ch )  <->  ( ( ph  /\  ch )  \/  ( -.  ph 
/\  ch ) ) )
53, 4bitri 249 . . . . 5  |-  ( ( ch  /\  ( ph  \/  -.  ph ) )  <-> 
( ( ph  /\  ch )  \/  ( -.  ph  /\  ch )
) )
62, 5syl6bb 261 . . . 4  |-  ( (
ph  \/  -.  ph )  ->  ( ch  <->  ( ( ph  /\  ch )  \/  ( -.  ph  /\  ch ) ) ) )
71, 6ax-mp 5 . . 3  |-  ( ch  <->  ( ( ph  /\  ch )  \/  ( -.  ph 
/\  ch ) ) )
87orbi2i 516 . 2  |-  ( (
ph  \/  ch )  <->  (
ph  \/  ( ( ph  /\  ch )  \/  ( -.  ph  /\  ch ) ) ) )
9 orass 521 . . . . 5  |-  ( ( ( ph  \/  ( ph  /\  ch ) )  \/  ( -.  ph  /\ 
ch ) )  <->  ( ph  \/  ( ( ph  /\  ch )  \/  ( -.  ph  /\  ch )
) ) )
109bicomi 202 . . . 4  |-  ( (
ph  \/  ( ( ph  /\  ch )  \/  ( -.  ph  /\  ch ) ) )  <->  ( ( ph  \/  ( ph  /\  ch ) )  \/  ( -.  ph  /\  ch )
) )
11 pm4.44 574 . . . . . 6  |-  ( ph  <->  (
ph  \/  ( ph  /\ 
ch ) ) )
1211bicomi 202 . . . . 5  |-  ( (
ph  \/  ( ph  /\ 
ch ) )  <->  ph )
1312orbi1i 517 . . . 4  |-  ( ( ( ph  \/  ( ph  /\  ch ) )  \/  ( -.  ph  /\ 
ch ) )  <->  ( ph  \/  ( -.  ph  /\  ch ) ) )
1410, 13bitri 249 . . 3  |-  ( (
ph  \/  ( ( ph  /\  ch )  \/  ( -.  ph  /\  ch ) ) )  <->  ( ph  \/  ( -.  ph  /\  ch ) ) )
15 jaoi2.1 . . 3  |-  ( (
ph  \/  ( -.  ph 
/\  ch ) )  ->  ps )
1614, 15sylbi 195 . 2  |-  ( (
ph  \/  ( ( ph  /\  ch )  \/  ( -.  ph  /\  ch ) ) )  ->  ps )
178, 16sylbi 195 1  |-  ( (
ph  \/  ch )  ->  ps )
Colors of variables: wff setvar class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 184    \/ wo 368    /\ wa 369
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 185  df-or 370  df-an 371
This theorem is referenced by: (None)
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