ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  xrmaxiflemlub Unicode version

Theorem xrmaxiflemlub 11992
Description: Lemma for xrmaxif 11995. A least upper bound for  { A ,  B }. (Contributed by Jim Kingdon, 28-Apr-2023.)
Hypotheses
Ref Expression
xrmaxiflemlub.a  |-  ( ph  ->  A  e.  RR* )
xrmaxiflemlub.b  |-  ( ph  ->  B  e.  RR* )
xrmaxiflemlub.c  |-  ( ph  ->  C  e.  RR* )
xrmaxiflemlub.clt  |-  ( ph  ->  C  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )
Assertion
Ref Expression
xrmaxiflemlub  |-  ( ph  ->  ( C  <  A  \/  C  <  B ) )

Proof of Theorem xrmaxiflemlub
StepHypRef Expression
1 xrmaxiflemlub.clt . . 3  |-  ( ph  ->  C  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )
2 xrmaxiflemlub.c . . . 4  |-  ( ph  ->  C  e.  RR* )
3 xrmaxiflemlub.a . . . . 5  |-  ( ph  ->  A  e.  RR* )
4 xrmaxiflemlub.b . . . . 5  |-  ( ph  ->  B  e.  RR* )
5 xrmaxiflemcl 11989 . . . . 5  |-  ( ( 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 ,  <  ) ) ) ) )  e.  RR* )
63, 4, 5syl2anc 415 . . . 4  |-  ( ph  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  e.  RR* )
7 xrltso 10177 . . . . 5  |-  <  Or  RR*
8 sowlin 4460 . . . . 5  |-  ( (  <  Or  RR*  /\  ( C  e.  RR*  /\  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  e.  RR*  /\  A  e.  RR* ) )  -> 
( C  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  ->  ( C  <  A  \/  A  < 
if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) ) ) )
97, 8mpan 428 . . . 4  |-  ( ( C  e.  RR*  /\  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  e.  RR*  /\  A  e.  RR* )  ->  ( C  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) )  ->  ( C  < 
A  \/  A  < 
if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) ) ) )
102, 6, 3, 9syl3anc 1278 . . 3  |-  ( ph  ->  ( C  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  ->  ( C  <  A  \/  A  < 
if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) ) ) )
111, 10mpd 13 . 2  |-  ( ph  ->  ( C  <  A  \/  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) ) )
121adantr 276 . . . . 5  |-  ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  ->  C  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )
133adantr 276 . . . . . 6  |-  ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  ->  A  e.  RR* )
144adantr 276 . . . . . 6  |-  ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  ->  B  e.  RR* )
15 simplr 533 . . . . . . . . 9  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  B  = +oo )  ->  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )
16 simpr 110 . . . . . . . . . 10  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  B  = +oo )  ->  B  = +oo )
1716iftrued 3644 . . . . . . . . 9  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  B  = +oo )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  = +oo )
1815, 17breqtrd 4151 . . . . . . . 8  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  B  = +oo )  ->  A  < +oo )
1918, 16breqtrrd 4153 . . . . . . 7  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  B  = +oo )  ->  A  <  B )
20 simplr 533 . . . . . . . . . . . 12  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  ->  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )
21 simpr 110 . . . . . . . . . . . . 13  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  ->  -.  B  = +oo )
2221iffalsed 3647 . . . . . . . . . . . 12  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  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 ,  <  )
) ) ) )
2320, 22breqtrd 4151 . . . . . . . . . . 11  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  ->  A  <  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )
2423adantr 276 . . . . . . . . . 10  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  A  <  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) )
25 simpr 110 . . . . . . . . . . 11  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  B  = -oo )
2625iftrued 3644 . . . . . . . . . 10  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) )  =  A )
2724, 26breqtrd 4151 . . . . . . . . 9  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  A  <  A )
28 xrltnr 10160 . . . . . . . . . . 11  |-  ( A  e.  RR*  ->  -.  A  <  A )
293, 28syl 14 . . . . . . . . . 10  |-  ( ph  ->  -.  A  <  A
)
3029ad3antrrr 496 . . . . . . . . 9  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  -.  A  <  A )
3127, 30pm2.21dd 629 . . . . . . . 8  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  B  = -oo )  ->  A  <  B )
3223adantr 276 . . . . . . . . . . . . 13  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  A  <  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )
33 simpr 110 . . . . . . . . . . . . . 14  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  -.  B  = -oo )
3433iffalsed 3647 . . . . . . . . . . . . 13  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  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 ,  <  )
) ) )
3532, 34breqtrd 4151 . . . . . . . . . . . 12  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  A  <  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) )
3635adantr 276 . . . . . . . . . . 11  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  A  = +oo )  ->  A  <  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) )
37 simpr 110 . . . . . . . . . . . 12  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  A  = +oo )  ->  A  = +oo )
3837iftrued 3644 . . . . . . . . . . 11  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  A  = +oo )  ->  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) )  = +oo )
3936, 38breqtrd 4151 . . . . . . . . . 10  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  A  = +oo )  ->  A  < +oo )
40 nltpnft 10195 . . . . . . . . . . . . 13  |-  ( A  e.  RR*  ->  ( A  = +oo  <->  -.  A  < +oo ) )
413, 40syl 14 . . . . . . . . . . . 12  |-  ( ph  ->  ( A  = +oo  <->  -.  A  < +oo ) )
4241ad4antr 498 . . . . . . . . . . 11  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  A  = +oo )  ->  ( A  = +oo  <->  -.  A  < +oo ) )
4337, 42mpbid 147 . . . . . . . . . 10  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  A  = +oo )  ->  -.  A  < +oo )
4439, 43pm2.21dd 629 . . . . . . . . 9  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  A  = +oo )  ->  A  <  B
)
4535adantr 276 . . . . . . . . . . . . 13  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  ->  A  <  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) )
46 simpr 110 . . . . . . . . . . . . . 14  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  ->  -.  A  = +oo )
4746iffalsed 3647 . . . . . . . . . . . . 13  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  ->  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) )  =  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) )
4845, 47breqtrd 4151 . . . . . . . . . . . 12  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  ->  A  <  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) )
4948adantr 276 . . . . . . . . . . 11  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  A  = -oo )  ->  A  <  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) )
50 simpr 110 . . . . . . . . . . . 12  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  A  = -oo )  ->  A  = -oo )
5150iftrued 3644 . . . . . . . . . . 11  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  A  = -oo )  ->  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
)  =  B )
5249, 51breqtrd 4151 . . . . . . . . . 10  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  A  = -oo )  ->  A  <  B )
5329ad5antr 500 . . . . . . . . . . 11  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  A  <  A
)
54 simp-5l 549 . . . . . . . . . . . . . . . . 17  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  ph )
55 simp-4r 548 . . . . . . . . . . . . . . . . 17  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  B  = +oo )
5654, 55jca 306 . . . . . . . . . . . . . . . 16  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  ( ph  /\  -.  B  = +oo )
)
57 simpllr 540 . . . . . . . . . . . . . . . 16  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  B  = -oo )
5856, 57jca 306 . . . . . . . . . . . . . . 15  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  ( ( ph  /\  -.  B  = +oo )  /\  -.  B  = -oo ) )
59 simplr 533 . . . . . . . . . . . . . . 15  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  A  = +oo )
6058, 59jca 306 . . . . . . . . . . . . . 14  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )
)
61 simpr 110 . . . . . . . . . . . . . 14  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  A  = -oo )
62 simplr 533 . . . . . . . . . . . . . . 15  |-  ( ( ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  A  = +oo )
63 simpr 110 . . . . . . . . . . . . . . 15  |-  ( ( ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  A  = -oo )
64 elxr 10157 . . . . . . . . . . . . . . . . 17  |-  ( A  e.  RR*  <->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
653, 64sylib 122 . . . . . . . . . . . . . . . 16  |-  ( ph  ->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
6665ad4antr 498 . . . . . . . . . . . . . . 15  |-  ( ( ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  ( A  e.  RR  \/  A  = +oo  \/  A  = -oo ) )
6762, 63, 66ecase23d 1391 . . . . . . . . . . . . . 14  |-  ( ( ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  A  e.  RR )
6860, 61, 67syl2anc 415 . . . . . . . . . . . . 13  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  A  e.  RR )
69 simp-4r 548 . . . . . . . . . . . . . . 15  |-  ( ( ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  B  = +oo )
70 simpllr 540 . . . . . . . . . . . . . . 15  |-  ( ( ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  -.  B  = -oo )
71 elxr 10157 . . . . . . . . . . . . . . . . 17  |-  ( B  e.  RR*  <->  ( B  e.  RR  \/  B  = +oo  \/  B  = -oo ) )
724, 71sylib 122 . . . . . . . . . . . . . . . 16  |-  ( ph  ->  ( B  e.  RR  \/  B  = +oo  \/  B  = -oo ) )
7372ad4antr 498 . . . . . . . . . . . . . . 15  |-  ( ( ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  ( B  e.  RR  \/  B  = +oo  \/  B  = -oo ) )
7469, 70, 73ecase23d 1391 . . . . . . . . . . . . . 14  |-  ( ( ( ( ( ph  /\ 
-.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  B  e.  RR )
7560, 61, 74syl2anc 415 . . . . . . . . . . . . 13  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  B  e.  RR )
7648adantr 276 . . . . . . . . . . . . . 14  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  A  <  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) )
7761iffalsed 3647 . . . . . . . . . . . . . 14  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) )  =  sup ( { A ,  B } ,  RR ,  <  ) )
7876, 77breqtrd 4151 . . . . . . . . . . . . 13  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  A  <  sup ( { A ,  B } ,  RR ,  <  )
)
79 maxleastlt 11959 . . . . . . . . . . . . 13  |-  ( ( ( A  e.  RR  /\  B  e.  RR )  /\  ( A  e.  RR  /\  A  <  sup ( { A ,  B } ,  RR ,  <  ) ) )  -> 
( A  <  A  \/  A  <  B ) )
8068, 75, 68, 78, 79syl22anc 1279 . . . . . . . . . . . 12  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  ( A  <  A  \/  A  <  B ) )
8180orcomd 741 . . . . . . . . . . 11  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  ( A  <  B  \/  A  <  A ) )
8253, 81ecased 1390 . . . . . . . . . 10  |-  ( ( ( ( ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  /\  -.  A  = -oo )  ->  A  <  B )
83 xrmnfdc 10224 . . . . . . . . . . . 12  |-  ( A  e.  RR*  -> DECID  A  = -oo )
84 exmiddc 848 . . . . . . . . . . . 12  |-  (DECID  A  = -oo  ->  ( A  = -oo  \/  -.  A  = -oo ) )
853, 83, 843syl 17 . . . . . . . . . . 11  |-  ( ph  ->  ( A  = -oo  \/  -.  A  = -oo ) )
8685ad4antr 498 . . . . . . . . . 10  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  ->  ( A  = -oo  \/  -.  A  = -oo ) )
8752, 82, 86mpjaodan 810 . . . . . . . . 9  |-  ( ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  /\  -.  A  = +oo )  ->  A  <  B
)
88 xrpnfdc 10223 . . . . . . . . . . 11  |-  ( A  e.  RR*  -> DECID  A  = +oo )
89 exmiddc 848 . . . . . . . . . . 11  |-  (DECID  A  = +oo  ->  ( A  = +oo  \/  -.  A  = +oo ) )
903, 88, 893syl 17 . . . . . . . . . 10  |-  ( ph  ->  ( A  = +oo  \/  -.  A  = +oo ) )
9190ad3antrrr 496 . . . . . . . . 9  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  ( A  = +oo  \/  -.  A  = +oo ) )
9244, 87, 91mpjaodan 810 . . . . . . . 8  |-  ( ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  )
) ) ) ) )  /\  -.  B  = +oo )  /\  -.  B  = -oo )  ->  A  <  B )
93 xrmnfdc 10224 . . . . . . . . . 10  |-  ( B  e.  RR*  -> DECID  B  = -oo )
94 exmiddc 848 . . . . . . . . . 10  |-  (DECID  B  = -oo  ->  ( B  = -oo  \/  -.  B  = -oo ) )
954, 93, 943syl 17 . . . . . . . . 9  |-  ( ph  ->  ( B  = -oo  \/  -.  B  = -oo ) )
9695ad2antrr 492 . . . . . . . 8  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  ->  ( B  = -oo  \/  -.  B  = -oo ) )
9731, 92, 96mpjaodan 810 . . . . . . 7  |-  ( ( ( ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  /\  -.  B  = +oo )  ->  A  <  B
)
98 xrpnfdc 10223 . . . . . . . 8  |-  ( B  e.  RR*  -> DECID  B  = +oo )
99 exmiddc 848 . . . . . . . 8  |-  (DECID  B  = +oo  ->  ( B  = +oo  \/  -.  B  = +oo ) )
10014, 98, 993syl 17 . . . . . . 7  |-  ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  ->  ( B  = +oo  \/  -.  B  = +oo )
)
10119, 97, 100mpjaodan 810 . . . . . 6  |-  ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  ->  A  <  B )
10213, 14, 101xrmaxiflemab 11991 . . . . 5  |-  ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  ->  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  =  B )
10312, 102breqtrd 4151 . . . 4  |-  ( (
ph  /\  A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  ->  C  <  B )
104103ex 115 . . 3  |-  ( ph  ->  ( A  <  if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) )  ->  C  <  B ) )
105104orim2d 800 . 2  |-  ( ph  ->  ( ( C  < 
A  \/  A  < 
if ( B  = +oo , +oo ,  if ( B  = -oo ,  A ,  if ( A  = +oo , +oo ,  if ( A  = -oo ,  B ,  sup ( { A ,  B } ,  RR ,  <  ) ) ) ) ) )  -> 
( C  <  A  \/  C  <  B ) ) )
10611, 105mpd 13 1  |-  ( ph  ->  ( C  <  A  \/  C  <  B ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    \/ wo 720  DECID wdc 846    \/ w3o 1008    /\ w3a 1009    = wceq 1402    e. wcel 2209   ifcif 3635   {cpr 3706   class class class wbr 4125    Or wor 4435   supcsup 7312   RRcr 8168   +oocpnf 8347   -oocmnf 8348   RR*cxr 8349    < clt 8350
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:  xrmaxiflemval  11994  xrmaxleastlt  12000
  Copyright terms: Public domain W3C validator