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Theorem xrmaxltsup 12002
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 1031 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  A  e.  RR* )
2 simpl2 1032 . . . . 5  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  B  e.  RR* )
3 xrmaxcl 11996 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  sup ( { A ,  B } ,  RR* ,  <  )  e.  RR* )
41, 2, 3syl2anc 415 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  sup ( { A ,  B } ,  RR* ,  <  )  e.  RR* )
5 simpl3 1033 . . . 4  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  C  e.  RR* )
6 xrmax1sup 11997 . . . . . 6  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  A  <_  sup ( { A ,  B } ,  RR* ,  <  ) )
763adant3 1048 . . . . 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 10191 . . 3  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  sup ( { A ,  B } ,  RR* ,  <  )  <  C )  ->  A  <  C )
11 xrmax2sup 11998 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  B  <_  sup ( { A ,  B } ,  RR* ,  <  ) )
121, 2, 11syl2anc 415 . . . 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 10191 . . 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 533 . . . . . . 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 540 . . . . . . 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 11999 . . . . . . 7  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  sup ( { A ,  B } ,  RR ,  <  ) )
1815, 16, 17syl2anc 415 . . . . . 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 548 . . . . . . 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 11962 . . . . . . . 8  |-  ( ( A  e.  RR  /\  B  e.  RR  /\  C  e.  RR )  ->  ( sup ( { A ,  B } ,  RR ,  <  )  <  C  <->  ( A  <  C  /\  B  < 
C ) ) )
2215, 16, 20, 21syl3anc 1278 . . . . . . 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 4147 . . . . 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 533 . . . . . . . . 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 540 . . . . . . . . 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 11954 . . . . . . . . 9  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  sup ( { A ,  B } ,  RR ,  <  )  e.  RR )
2825, 26, 27syl2anc 415 . . . . . . . 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 2307 . . . . . . . . 9  |-  ( ( A  e.  RR  /\  B  e.  RR )  ->  ( sup ( { A ,  B } ,  RR* ,  <  )  e.  RR  <->  sup ( { A ,  B } ,  RR ,  <  )  e.  RR ) )
3025, 26, 29syl2anc 415 . . . . . . . 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 10161 . . . . . . 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 4153 . . . . 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 535 . . . . . . 7  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  ->  A  <  C )
3736ad3antrrr 496 . . . . . 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 10169 . . . . . . . . 9  |-  ( A  e.  RR*  ->  -.  A  < -oo )
39383ad2ant1 1049 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  -.  A  < -oo )
4039ad4antr 498 . . . . . . 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 4137 . . . . . . 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 684 . . . . . 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 629 . . . . 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 10157 . . . . . . . 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 1051 . . . . . 6  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( C  e.  RR  \/  C  = +oo  \/  C  = -oo ) )
4847ad3antrrr 496 . . . . 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 1348 . . . 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 492 . . . . 5  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = +oo )  ->  A  <  C
)
51 pnfnlt 10168 . . . . . . . 8  |-  ( C  e.  RR*  ->  -. +oo  <  C )
52513ad2ant3 1051 . . . . . . 7  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  -. +oo 
<  C )
5352ad3antrrr 496 . . . . . 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 4135 . . . . . 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 684 . . . . 5  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = +oo )  ->  -.  A  <  C )
5750, 56pm2.21dd 629 . . . 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 10173 . . . . . . . . 9  |-  ( B  e.  RR*  -> -oo  <_  B )
60593ad2ant2 1050 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  -> -oo  <_  B )
6160ad3antrrr 496 . . . . . . 7  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  -> -oo  <_  B )
6258, 61eqbrtrd 4147 . . . . . 6  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  A  <_  B
)
63 simp1 1028 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  A  e.  RR* )
6463ad3antrrr 496 . . . . . . 7  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  A  e.  RR* )
65 simp2 1029 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  B  e.  RR* )
6665ad3antrrr 496 . . . . . . 7  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  B  e.  RR* )
67 xrmaxleim 11988 . . . . . . 7  |-  ( ( A  e.  RR*  /\  B  e.  RR* )  ->  ( A  <_  B  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  B ) )
6864, 66, 67syl2anc 415 . . . . . 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 537 . . . . . 6  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  ->  B  <  C )
7170ad2antrr 492 . . . . 5  |-  ( ( ( ( ( A  e.  RR*  /\  B  e. 
RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  /\  B  e.  RR )  /\  A  = -oo )  ->  B  <  C
)
7269, 71eqbrtrd 4147 . . . 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 10157 . . . . . . 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 1049 . . . . 5  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  ->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
7675ad2antrr 492 . . . 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 1348 . . 3  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  e.  RR )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
78 simplrr 542 . . . . 5  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = +oo )  ->  B  <  C )
79 breq1 4128 . . . . . 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 492 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = +oo )  ->  -. +oo 
<  C )
8381, 82pm2.21dd 629 . . 3  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = +oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
84 prcom 3783 . . . . . 6  |-  { B ,  A }  =  { A ,  B }
8584supeq1i 7318 . . . . 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 10173 . . . . . . . . 9  |-  ( A  e.  RR*  -> -oo  <_  A )
88873ad2ant1 1049 . . . . . . . 8  |-  ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e. 
RR* )  -> -oo  <_  A )
8988ad2antrr 492 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  -> -oo  <_  A )
9086, 89eqbrtrd 4147 . . . . . 6  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  B  <_  A )
91 simpll2 1068 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  B  e.  RR* )
92 simpll1 1067 . . . . . . 7  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  A  e.  RR* )
93 xrmaxleim 11988 . . . . . . 7  |-  ( ( B  e.  RR*  /\  A  e.  RR* )  ->  ( B  <_  A  ->  sup ( { B ,  A } ,  RR* ,  <  )  =  A ) )
9491, 92, 93syl2anc 415 . . . . . 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 2285 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  =  A )
97 simplrl 541 . . . 4  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  A  <  C )
9896, 97eqbrtrd 4147 . . 3  |-  ( ( ( ( A  e. 
RR*  /\  B  e.  RR* 
/\  C  e.  RR* )  /\  ( A  < 
C  /\  B  <  C ) )  /\  B  = -oo )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
99 elxr 10157 . . . . . 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 1050 . . . 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 1348 . 2  |-  ( ( ( A  e.  RR*  /\  B  e.  RR*  /\  C  e.  RR* )  /\  ( A  <  C  /\  B  <  C ) )  ->  sup ( { A ,  B } ,  RR* ,  <  )  <  C )
10414, 103impbida 604 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 1008    /\ w3a 1009    = wceq 1402    e. wcel 2209   {cpr 3706   class class class wbr 4125   supcsup 7312   RRcr 8168   +oocpnf 8347   -oocmnf 8348   RR*cxr 8349    < clt 8350    <_ cle 8351
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4241  ax-sep 4244  ax-nul 4254  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-iinf 4730  ax-cnex 8260  ax-resscn 8261  ax-1cn 8262  ax-1re 8263  ax-icn 8264  ax-addcl 8265  ax-addrcl 8266  ax-mulcl 8267  ax-mulrcl 8268  ax-addcom 8269  ax-mulcom 8270  ax-addass 8271  ax-mulass 8272  ax-distr 8273  ax-i2m1 8274  ax-0lt1 8275  ax-1rid 8276  ax-0id 8277  ax-rnegex 8278  ax-precex 8279  ax-cnre 8280  ax-pre-ltirr 8281  ax-pre-ltwlin 8282  ax-pre-lttrn 8283  ax-pre-apti 8284  ax-pre-ltadd 8285  ax-pre-mulgt0 8286  ax-pre-mulext 8287  ax-arch 8288  ax-caucvg 8289
This theorem depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3636  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-int 3966  df-iun 4009  df-br 4126  df-opab 4188  df-mpt 4189  df-tr 4225  df-id 4433  df-po 4436  df-iso 4437  df-iord 4506  df-on 4508  df-ilim 4509  df-suc 4511  df-iom 4733  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-ima 4782  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-riota 6028  df-ov 6078  df-oprab 6079  df-mpo 6080  df-1st 6364  df-2nd 6365  df-recs 6566  df-frec 6652  df-sup 7314  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356  df-sub 8489  df-neg 8490  df-reap 8893  df-ap 8900  df-div 8993  df-inn 9284  df-2 9342  df-3 9343  df-4 9344  df-n0 9543  df-z 9624  df-uz 9901  df-rp 10034  df-seqfrec 10863  df-exp 10954  df-cj 11585  df-re 11586  df-im 11587  df-rsqrt 11742  df-abs 11743
This theorem is referenced by:  xrmaxadd  12005  xrltmininf  12014  iooinsup  12021  xmetxpbl  15532  txmetcnp  15542
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