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Theorem xrmaxltsup 11423
Description: Two ways of saying the maximum of two numbers is less than a third. (Contributed by Jim Kingdon, 30-Apr-2023.)
Assertion
Ref Expression
xrmaxltsup  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( sup ( { A ,  B } ,  RR* ,  <  )  <  C  <->  ( A  <  C  /\  B  < 
C ) ) )

Proof of Theorem xrmaxltsup
StepHypRef Expression
1 simpl1 1002 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  A  e.  RR* )
2 simpl2 1003 . . . . 5  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  B  e.  RR* )
3 xrmaxcl 11417 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  sup ( { A ,  B } ,  RR* ,  <  )  e.  RR* )
41, 2, 3syl2anc 411 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  sup ( { A ,  B } ,  RR* ,  <  )  e.  RR* )
5 simpl3 1004 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  C  e.  RR* )
6 xrmax1sup 11418 . . . . . 6  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  A  <_  sup ( { A ,  B } ,  RR* ,  <  ) )
763adant3 1019 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  A  <_  sup ( { A ,  B } ,  RR* ,  <  ) )
87adantr 276 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  A  <_  sup ( { A ,  B } ,  RR* ,  <  ) )
9 simpr 110 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
101, 4, 5, 8, 9xrlelttrd 9885 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  A  <  C )
11 xrmax2sup 11419 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  B  <_  sup ( { A ,  B } ,  RR* ,  <  ) )
121, 2, 11syl2anc 411 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  B  <_  sup ( { A ,  B } ,  RR* ,  <  ) )
132, 4, 5, 12, 9xrlelttrd 9885 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  B  <  C )
1410, 13jca 306 . 2  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  -> 
( A  <  C  /\  B  <  C ) )
15 simplr 528 . . . . . . 7  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  e.  RR )  ->  A  e.  RR )
16 simpllr 534 . . . . . . 7  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  e.  RR )  ->  B  e.  RR )
17 xrmaxrecl 11420 . . . . . . 7  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  sup ( { A ,  B } ,  RR ,  <  ) )
1815, 16, 17syl2anc 411 . . . . . 6  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  e.  RR )  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  sup ( { A ,  B } ,  RR ,  <  ) )
19 simp-4r 542 . . . . . . 7  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  e.  RR )  ->  ( A  < 
C  /\  B  <  C ) )
20 simpr 110 . . . . . . . 8  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  e.  RR )  ->  C  e.  RR )
21 maxltsup 11383 . . . . . . . 8  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  ( sup ( { A ,  B } ,  RR ,  <  )  <  C  <->  ( A  <  C  /\  B  < 
C ) ) )
2215, 16, 20, 21syl3anc 1249 . . . . . . 7  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  e.  RR )  ->  ( sup ( { A ,  B } ,  RR ,  <  )  <  C  <->  ( A  < 
C  /\  B  <  C ) ) )
2319, 22mpbird 167 . . . . . 6  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  e.  RR )  ->  sup ( { A ,  B } ,  RR ,  <  )  <  C
)
2418, 23eqbrtrd 4055 . . . . 5  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  e.  RR )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C
)
25 simplr 528 . . . . . . . . 9  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = +oo )  ->  A  e.  RR )
26 simpllr 534 . . . . . . . . 9  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = +oo )  ->  B  e.  RR )
27 maxcl 11375 . . . . . . . . 9  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  sup ( { A ,  B } ,  RR ,  <  )  e.  RR )
2825, 26, 27syl2anc 411 . . . . . . . 8  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = +oo )  ->  sup ( { A ,  B } ,  RR ,  <  )  e.  RR )
2917eleq1d 2265 . . . . . . . . 9  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  ( sup ( { A ,  B } ,  RR* ,  <  )  e.  RR  <->  sup ( { A ,  B } ,  RR ,  <  )  e.  RR ) )
3025, 26, 29syl2anc 411 . . . . . . . 8  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = +oo )  ->  ( sup ( { A ,  B } ,  RR* ,  <  )  e.  RR  <->  sup ( { A ,  B } ,  RR ,  <  )  e.  RR ) )
3128, 30mpbird 167 . . . . . . 7  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = +oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  e.  RR )
32 ltpnf 9855 . . . . . . 7  |-  ( sup ( { A ,  B } ,  RR* ,  <  )  e.  RR  ->  sup ( { A ,  B } ,  RR* ,  <  )  < +oo )
3331, 32syl 14 . . . . . 6  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = +oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  < +oo )
34 simpr 110 . . . . . 6  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = +oo )  ->  C  = +oo )
3533, 34breqtrrd 4061 . . . . 5  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = +oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C
)
36 simprl 529 . . . . . . 7  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  ->  A  <  C )
3736ad3antrrr 492 . . . . . 6  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = -oo )  ->  A  <  C
)
38 nltmnf 9863 . . . . . . . . 9  |-  ( A  e.  RR*  ->  -.  A  < -oo )
39383ad2ant1 1020 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  -.  A  < -oo )
4039ad4antr 494 . . . . . . 7  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = -oo )  ->  -.  A  < -oo )
41 simpr 110 . . . . . . . 8  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = -oo )  ->  C  = -oo )
4241breq2d 4045 . . . . . . 7  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = -oo )  ->  ( A  < 
C  <->  A  < -oo )
)
4340, 42mtbird 674 . . . . . 6  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = -oo )  ->  -.  A  <  C )
4437, 43pm2.21dd 621 . . . . 5  |-  ( ( ( ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  /\  C  = -oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C
)
45 elxr 9851 . . . . . . . 8  |-  ( C  e.  RR*  <->  ( C  e.  RR  \/  C  = +oo  \/  C  = -oo ) )
4645biimpi 120 . . . . . . 7  |-  ( C  e.  RR*  ->  ( C  e.  RR  \/  C  = +oo  \/  C  = -oo ) )
47463ad2ant3 1022 . . . . . 6  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( C  e.  RR  \/  C  = +oo  \/  C  = -oo ) )
4847ad3antrrr 492 . . . . 5  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  ->  ( C  e.  RR  \/  C  = +oo  \/  C  = -oo ) )
4924, 35, 44, 48mpjao3dan 1318 . . . 4  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  e.  RR )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C
)
5036ad2antrr 488 . . . . 5  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = +oo )  ->  A  <  C
)
51 pnfnlt 9862 . . . . . . . 8  |-  ( C  e.  RR*  ->  -. +oo  <  C )
52513ad2ant3 1022 . . . . . . 7  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  -. +oo 
<  C )
5352ad3antrrr 492 . . . . . 6  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = +oo )  ->  -. +oo  <  C
)
54 simpr 110 . . . . . . 7  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = +oo )  ->  A  = +oo )
5554breq1d 4043 . . . . . 6  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = +oo )  ->  ( A  < 
C  <-> +oo  <  C )
)
5653, 55mtbird 674 . . . . 5  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = +oo )  ->  -.  A  <  C )
5750, 56pm2.21dd 621 . . . 4  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = +oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C
)
58 simpr 110 . . . . . . 7  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  A  = -oo )
59 mnfle 9867 . . . . . . . . 9  |-  ( B  e.  RR*  -> -oo  <_  B )
60593ad2ant2 1021 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  -> -oo  <_  B )
6160ad3antrrr 492 . . . . . . 7  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  -> -oo  <_  B )
6258, 61eqbrtrd 4055 . . . . . 6  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  A  <_  B
)
63 simp1 999 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  A  e.  RR* )
6463ad3antrrr 492 . . . . . . 7  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  A  e.  RR* )
65 simp2 1000 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  B  e.  RR* )
6665ad3antrrr 492 . . . . . . 7  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  B  e.  RR* )
67 xrmaxleim 11409 . . . . . . 7  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  <_  B  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  B ) )
6864, 66, 67syl2anc 411 . . . . . 6  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  ( A  <_  B  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  B ) )
6962, 68mpd 13 . . . . 5  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  B )
70 simprr 531 . . . . . 6  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  ->  B  <  C )
7170ad2antrr 488 . . . . 5  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  B  <  C
)
7269, 71eqbrtrd 4055 . . . 4  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C
)
73 elxr 9851 . . . . . . 7  |-  ( A  e.  RR*  <->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
7473biimpi 120 . . . . . 6  |-  ( A  e.  RR*  ->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
75743ad2ant1 1020 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
7675ad2antrr 488 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  e.  RR )  ->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
7749, 57, 72, 76mpjao3dan 1318 . . 3  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  e.  RR )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
78 simplrr 536 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = +oo )  ->  B  <  C )
79 breq1 4036 . . . . . 6  |-  ( B  = +oo  ->  ( B  <  C  <-> +oo  <  C
) )
8079adantl 277 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = +oo )  ->  ( B  <  C  <-> +oo  <  C
) )
8178, 80mpbid 147 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = +oo )  -> +oo  <  C )
8252ad2antrr 488 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = +oo )  ->  -. +oo 
<  C )
8381, 82pm2.21dd 621 . . 3  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = +oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
84 prcom 3698 . . . . . 6  |-  { B ,  A }  =  { A ,  B }
8584supeq1i 7054 . . . . 5  |-  sup ( { B ,  A } ,  RR* ,  <  )  =  sup ( { A ,  B } ,  RR* ,  <  )
86 simpr 110 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  B  = -oo )
87 mnfle 9867 . . . . . . . . 9  |-  ( A  e.  RR*  -> -oo  <_  A )
88873ad2ant1 1020 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  -> -oo  <_  A )
8988ad2antrr 488 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  -> -oo  <_  A )
9086, 89eqbrtrd 4055 . . . . . 6  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  B  <_  A )
91 simpll2 1039 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  B  e.  RR* )
92 simpll1 1038 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  A  e.  RR* )
93 xrmaxleim 11409 . . . . . . 7  |-  ( ( B  e.  RR*  /\  A  e.  RR* )  ->  ( B  <_  A  ->  sup ( { B ,  A } ,  RR* ,  <  )  =  A ) )
9491, 92, 93syl2anc 411 . . . . . 6  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  ( B  <_  A  ->  sup ( { B ,  A } ,  RR* ,  <  )  =  A ) )
9590, 94mpd 13 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  sup ( { B ,  A } ,  RR* ,  <  )  =  A )
9685, 95eqtr3id 2243 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  A )
97 simplrl 535 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  A  <  C )
9896, 97eqbrtrd 4055 . . 3  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
99 elxr 9851 . . . . . 6  |-  ( B  e.  RR*  <->  ( B  e.  RR  \/  B  = +oo  \/  B  = -oo ) )
10099biimpi 120 . . . . 5  |-  ( B  e.  RR*  ->  ( B  e.  RR  \/  B  = +oo  \/  B  = -oo ) )
1011003ad2ant2 1021 . . . 4  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( B  e.  RR  \/  B  = +oo  \/  B  = -oo ) )
102101adantr 276 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  -> 
( B  e.  RR  \/  B  = +oo  \/  B  = -oo ) )
10377, 83, 98, 102mpjao3dan 1318 . 2  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
10414, 103impbida 596 1  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( sup ( { A ,  B } ,  RR* ,  <  )  <  C  <->  ( A  <  C  /\  B  < 
C ) ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    \/ w3o 979    /\ w3a 980    = wceq 1364    e. wcel 2167   {cpr 3623   class class class wbr 4033   supcsup 7048   RRcr 7878   +oocpnf 8058   -oocmnf 8059   RR*cxr 8060    < clt 8061    <_ cle 8062
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-coll 4148  ax-sep 4151  ax-nul 4159  ax-pow 4207  ax-pr 4242  ax-un 4468  ax-setind 4573  ax-iinf 4624  ax-cnex 7970  ax-resscn 7971  ax-1cn 7972  ax-1re 7973  ax-icn 7974  ax-addcl 7975  ax-addrcl 7976  ax-mulcl 7977  ax-mulrcl 7978  ax-addcom 7979  ax-mulcom 7980  ax-addass 7981  ax-mulass 7982  ax-distr 7983  ax-i2m1 7984  ax-0lt1 7985  ax-1rid 7986  ax-0id 7987  ax-rnegex 7988  ax-precex 7989  ax-cnre 7990  ax-pre-ltirr 7991  ax-pre-ltwlin 7992  ax-pre-lttrn 7993  ax-pre-apti 7994  ax-pre-ltadd 7995  ax-pre-mulgt0 7996  ax-pre-mulext 7997  ax-arch 7998  ax-caucvg 7999
This theorem depends on definitions:  df-bi 117  df-dc 836  df-3or 981  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ne 2368  df-nel 2463  df-ral 2480  df-rex 2481  df-reu 2482  df-rmo 2483  df-rab 2484  df-v 2765  df-sbc 2990  df-csb 3085  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-nul 3451  df-if 3562  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-int 3875  df-iun 3918  df-br 4034  df-opab 4095  df-mpt 4096  df-tr 4132  df-id 4328  df-po 4331  df-iso 4332  df-iord 4401  df-on 4403  df-ilim 4404  df-suc 4406  df-iom 4627  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-rn 4674  df-res 4675  df-ima 4676  df-iota 5219  df-fun 5260  df-fn 5261  df-f 5262  df-f1 5263  df-fo 5264  df-f1o 5265  df-fv 5266  df-riota 5877  df-ov 5925  df-oprab 5926  df-mpo 5927  df-1st 6198  df-2nd 6199  df-recs 6363  df-frec 6449  df-sup 7050  df-pnf 8063  df-mnf 8064  df-xr 8065  df-ltxr 8066  df-le 8067  df-sub 8199  df-neg 8200  df-reap 8602  df-ap 8609  df-div 8700  df-inn 8991  df-2 9049  df-3 9050  df-4 9051  df-n0 9250  df-z 9327  df-uz 9602  df-rp 9729  df-seqfrec 10540  df-exp 10631  df-cj 11007  df-re 11008  df-im 11009  df-rsqrt 11163  df-abs 11164
This theorem is referenced by:  xrmaxadd  11426  xrltmininf  11435  iooinsup  11442  xmetxpbl  14744  txmetcnp  14754
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