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Theorem xrmaxiflemcom 10857
Description: Lemma for xrmaxif 10859. Commutativity of an expression which we will later show to be the supremum. (Contributed by Jim Kingdon, 29-Apr-2023.)
Assertion
Ref Expression
xrmaxiflemcom  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) )

Proof of Theorem xrmaxiflemcom
StepHypRef Expression
1 simpr 109 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  B  = +oo )
21iftrued 3428 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) )  = +oo )
3 xrpnfdc 9466 . . . . . . 7  |-  ( A  e.  RR*  -> DECID  A  = +oo )
43ad2antrr 475 . . . . . 6  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  -> DECID 
A  = +oo )
5 exmiddc 788 . . . . . 6  |-  (DECID  A  = +oo  ->  ( A  = +oo  \/  -.  A  = +oo ) )
64, 5syl 14 . . . . 5  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( A  = +oo  \/  -.  A  = +oo ) )
7 eqid 2100 . . . . . . . 8  |- +oo  = +oo
87biantru 298 . . . . . . 7  |-  ( A  = +oo  <->  ( A  = +oo  /\ +oo  = +oo ) )
98a1i 9 . . . . . 6  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( A  = +oo  <->  ( A  = +oo  /\ +oo  = +oo ) ) )
10 xrmnfdc 9467 . . . . . . . . . . 11  |-  ( A  e.  RR*  -> DECID  A  = -oo )
1110ad2antrr 475 . . . . . . . . . 10  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  -> DECID 
A  = -oo )
12 exmiddc 788 . . . . . . . . . 10  |-  (DECID  A  = -oo  ->  ( A  = -oo  \/  -.  A  = -oo ) )
1311, 12syl 14 . . . . . . . . 9  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( A  = -oo  \/  -.  A  = -oo ) )
14 iba 296 . . . . . . . . . . . 12  |-  ( +oo  =  B  ->  ( A  = -oo  <->  ( A  = -oo  /\ +oo  =  B ) ) )
1514eqcoms 2103 . . . . . . . . . . 11  |-  ( B  = +oo  ->  ( A  = -oo  <->  ( A  = -oo  /\ +oo  =  B ) ) )
1615adantl 273 . . . . . . . . . 10  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( A  = -oo  <->  ( A  = -oo  /\ +oo  =  B ) ) )
171iftrued 3428 . . . . . . . . . . . 12  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) )  = +oo )
1817eqcomd 2105 . . . . . . . . . . 11  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  -> +oo  =  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) )
1918biantrud 300 . . . . . . . . . 10  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( -.  A  = -oo  <->  ( -.  A  = -oo  /\ +oo  =  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) )
2016, 19orbi12d 748 . . . . . . . . 9  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( ( A  = -oo  \/  -.  A  = -oo )  <->  ( ( A  = -oo  /\ +oo  =  B )  \/  ( -.  A  = -oo  /\ +oo  =  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) ) )
2113, 20mpbid 146 . . . . . . . 8  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( ( A  = -oo  /\ +oo  =  B )  \/  ( -.  A  = -oo  /\ +oo  =  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) ) )
22 eqifdc 3453 . . . . . . . . 9  |-  (DECID  A  = -oo  ->  ( +oo  =  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) )  <->  ( ( A  = -oo  /\ +oo  =  B )  \/  ( -.  A  = -oo  /\ +oo  =  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) ) ) )
2311, 22syl 14 . . . . . . . 8  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( +oo  =  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) )  <->  ( ( A  = -oo  /\ +oo  =  B )  \/  ( -.  A  = -oo  /\ +oo  =  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) ) ) )
2421, 23mpbird 166 . . . . . . 7  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  -> +oo  =  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) )
2524biantrud 300 . . . . . 6  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( -.  A  = +oo  <->  ( -.  A  = +oo  /\ +oo  =  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) ) ) )
269, 25orbi12d 748 . . . . 5  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( ( A  = +oo  \/  -.  A  = +oo )  <->  ( ( A  = +oo  /\ +oo  = +oo )  \/  ( -.  A  = +oo  /\ +oo  =  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) ) ) ) )
276, 26mpbid 146 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( ( A  = +oo  /\ +oo  = +oo )  \/  ( -.  A  = +oo  /\ +oo  =  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) ) )
28 eqifdc 3453 . . . . 5  |-  (DECID  A  = +oo  ->  ( +oo  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) )  <->  ( ( A  = +oo  /\ +oo  = +oo )  \/  ( -.  A  = +oo  /\ +oo  =  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) ) ) )
294, 28syl 14 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  ( +oo  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) )  <->  ( ( A  = +oo  /\ +oo  = +oo )  \/  ( -.  A  = +oo  /\ +oo  =  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) ) ) )
3027, 29mpbird 166 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  -> +oo  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) ) )
312, 30eqtrd 2132 . 2  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  B  = +oo )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) )
323, 5syl 14 . . . . . . . 8  |-  ( A  e.  RR*  ->  ( A  = +oo  \/  -.  A  = +oo )
)
3332ad3antrrr 479 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( A  = +oo  \/  -.  A  = +oo )
)
34 pm4.24 390 . . . . . . . . 9  |-  ( A  = +oo  <->  ( A  = +oo  /\  A  = +oo ) )
3534a1i 9 . . . . . . . 8  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( A  = +oo  <->  ( A  = +oo  /\  A  = +oo ) ) )
3610ad3antrrr 479 . . . . . . . . . . . 12  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  -> DECID  A  = -oo )
3736, 12syl 14 . . . . . . . . . . 11  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( A  = -oo  \/  -.  A  = -oo )
)
38 simpr 109 . . . . . . . . . . . . . . 15  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  B  = -oo )
3938eqeq2d 2111 . . . . . . . . . . . . . 14  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( A  =  B  <->  A  = -oo ) )
4039anbi2d 455 . . . . . . . . . . . . 13  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  (
( A  = -oo  /\  A  =  B )  <-> 
( A  = -oo  /\  A  = -oo )
) )
41 anidm 391 . . . . . . . . . . . . 13  |-  ( ( A  = -oo  /\  A  = -oo )  <->  A  = -oo )
4240, 41syl6rbb 196 . . . . . . . . . . . 12  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( A  = -oo  <->  ( A  = -oo  /\  A  =  B ) ) )
43 eqid 2100 . . . . . . . . . . . . . 14  |-  A  =  A
4443biantru 298 . . . . . . . . . . . . 13  |-  ( -.  A  = -oo  <->  ( -.  A  = -oo  /\  A  =  A ) )
4544a1i 9 . . . . . . . . . . . 12  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( -.  A  = -oo  <->  ( -.  A  = -oo  /\  A  =  A ) ) )
4642, 45orbi12d 748 . . . . . . . . . . 11  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  (
( A  = -oo  \/  -.  A  = -oo ) 
<->  ( ( A  = -oo  /\  A  =  B )  \/  ( -.  A  = -oo  /\  A  =  A ) ) ) )
4737, 46mpbid 146 . . . . . . . . . 10  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  (
( A  = -oo  /\  A  =  B )  \/  ( -.  A  = -oo  /\  A  =  A ) ) )
48 eqifdc 3453 . . . . . . . . . . 11  |-  (DECID  A  = -oo  ->  ( A  =  if ( A  = -oo ,  B ,  A )  <->  ( ( A  = -oo  /\  A  =  B )  \/  ( -.  A  = -oo  /\  A  =  A ) ) ) )
4936, 48syl 14 . . . . . . . . . 10  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( A  =  if ( A  = -oo ,  B ,  A )  <->  ( ( A  = -oo  /\  A  =  B )  \/  ( -.  A  = -oo  /\  A  =  A ) ) ) )
5047, 49mpbird 166 . . . . . . . . 9  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  A  =  if ( A  = -oo ,  B ,  A ) )
5150biantrud 300 . . . . . . . 8  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( -.  A  = +oo  <->  ( -.  A  = +oo  /\  A  =  if ( A  = -oo ,  B ,  A )
) ) )
5235, 51orbi12d 748 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  (
( A  = +oo  \/  -.  A  = +oo ) 
<->  ( ( A  = +oo  /\  A  = +oo )  \/  ( -.  A  = +oo  /\  A  =  if ( A  = -oo ,  B ,  A )
) ) ) )
5333, 52mpbid 146 . . . . . 6  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  (
( A  = +oo  /\  A  = +oo )  \/  ( -.  A  = +oo  /\  A  =  if ( A  = -oo ,  B ,  A ) ) ) )
543ad3antrrr 479 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  -> DECID  A  = +oo )
55 eqifdc 3453 . . . . . . 7  |-  (DECID  A  = +oo  ->  ( A  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  A ) )  <->  ( ( A  = +oo  /\  A  = +oo )  \/  ( -.  A  = +oo  /\  A  =  if ( A  = -oo ,  B ,  A )
) ) ) )
5654, 55syl 14 . . . . . 6  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  ( A  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  A ) )  <->  ( ( A  = +oo  /\  A  = +oo )  \/  ( -.  A  = +oo  /\  A  =  if ( A  = -oo ,  B ,  A )
) ) ) )
5753, 56mpbird 166 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  A  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  A ) ) )
5838iftrued 3428 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) )  =  A )
5938iftrued 3428 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
)  =  A )
6059ifeq2d 3437 . . . . . 6  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) )  =  if ( A  = -oo ,  B ,  A ) )
6160ifeq2d 3437 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  A ) ) )
6257, 58, 613eqtr4d 2142 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) ) ) )
63 simpr 109 . . . . . 6  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  -.  B  = -oo )
6463iffalsed 3431 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) )
6563iffalsed 3431 . . . . . . . 8  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) )  =  sup ( { B ,  A } ,  RR ,  <  ) )
6665ifeq2d 3437 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) )  =  if ( A  = -oo ,  B ,  sup ( { B ,  A } ,  RR ,  <  )
) )
6766ifeq2d 3437 . . . . . 6  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { B ,  A } ,  RR ,  <  )
) ) )
68 maxcom 10815 . . . . . . 7  |-  sup ( { B ,  A } ,  RR ,  <  )  =  sup ( { A ,  B } ,  RR ,  <  )
69 ifeq2 3425 . . . . . . 7  |-  ( sup ( { B ,  A } ,  RR ,  <  )  =  sup ( { A ,  B } ,  RR ,  <  )  ->  if ( A  = -oo ,  B ,  sup ( { B ,  A } ,  RR ,  <  ) )  =  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) )
70 ifeq2 3425 . . . . . . 7  |-  ( if ( A  = -oo ,  B ,  sup ( { B ,  A } ,  RR ,  <  )
)  =  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
)  ->  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { B ,  A } ,  RR ,  <  ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) )
7168, 69, 70mp2b 8 . . . . . 6  |-  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { B ,  A } ,  RR ,  <  ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) )
7267, 71syl6eq 2148 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) )
7364, 72eqtr4d 2135 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) )
74 xrmnfdc 9467 . . . . . 6  |-  ( B  e.  RR*  -> DECID  B  = -oo )
75 exmiddc 788 . . . . . 6  |-  (DECID  B  = -oo  ->  ( B  = -oo  \/  -.  B  = -oo ) )
7674, 75syl 14 . . . . 5  |-  ( B  e.  RR*  ->  ( B  = -oo  \/  -.  B  = -oo )
)
7776ad2antlr 476 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  ->  ( B  = -oo  \/  -.  B  = -oo ) )
7862, 73, 77mpjaodan 753 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  ->  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) )
79 simpr 109 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  ->  -.  B  = +oo )
8079iffalsed 3431 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) )  =  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) )
8179iffalsed 3431 . . . . 5  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) )  =  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  ) ) )
8281ifeq2d 3437 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  ->  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) )  =  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) )
8382ifeq2d 3437 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  ->  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) )
8478, 80, 833eqtr4d 2142 . 2  |-  ( ( ( A  e.  RR*  /\  B  e.  RR* )  /\  -.  B  = +oo )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) )
85 xrpnfdc 9466 . . . 4  |-  ( B  e.  RR*  -> DECID  B  = +oo )
86 exmiddc 788 . . . 4  |-  (DECID  B  = +oo  ->  ( B  = +oo  \/  -.  B  = +oo ) )
8785, 86syl 14 . . 3  |-  ( B  e.  RR*  ->  ( B  = +oo  \/  -.  B  = +oo )
)
8887adantl 273 . 2  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( B  = +oo  \/  -.  B  = +oo )
)
8931, 84, 88mpjaodan 753 1  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  =  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  sup ( { B ,  A } ,  RR ,  <  )
) ) ) ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 103    <-> wb 104    \/ wo 670  DECID wdc 786    = wceq 1299    e. wcel 1448   ifcif 3421   {cpr 3475   supcsup 6784   RRcr 7499   +oocpnf 7669   -oocmnf 7670   RR*cxr 7671    < clt 7672
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 584  ax-in2 585  ax-io 671  ax-5 1391  ax-7 1392  ax-gen 1393  ax-ie1 1437  ax-ie2 1438  ax-8 1450  ax-10 1451  ax-11 1452  ax-i12 1453  ax-bndl 1454  ax-4 1455  ax-13 1459  ax-14 1460  ax-17 1474  ax-i9 1478  ax-ial 1482  ax-i5r 1483  ax-ext 2082  ax-sep 3986  ax-pow 4038  ax-un 4293  ax-setind 4390  ax-cnex 7586  ax-resscn 7587
This theorem depends on definitions:  df-bi 116  df-dc 787  df-3or 931  df-3an 932  df-tru 1302  df-fal 1305  df-nf 1405  df-sb 1704  df-clab 2087  df-cleq 2093  df-clel 2096  df-nfc 2229  df-ne 2268  df-nel 2363  df-ral 2380  df-rex 2381  df-rab 2384  df-v 2643  df-dif 3023  df-un 3025  df-in 3027  df-ss 3034  df-if 3422  df-pw 3459  df-sn 3480  df-pr 3481  df-uni 3684  df-sup 6786  df-pnf 7674  df-mnf 7675  df-xr 7676
This theorem is referenced by:  xrmaxiflemval  10858
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