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Theorem suprleubex 9230
Description: The supremum of a nonempty bounded set of reals is less than or equal to an upper bound. (Contributed by NM, 18-Mar-2005.) (Revised by Mario Carneiro, 6-Sep-2014.)
Hypotheses
Ref Expression
suprubex.ex  |-  ( ph  ->  E. x  e.  RR  ( A. y  e.  A  -.  x  <  y  /\  A. y  e.  RR  (
y  <  x  ->  E. z  e.  A  y  <  z ) ) )
suprubex.ss  |-  ( ph  ->  A  C_  RR )
suprlubex.b  |-  ( ph  ->  B  e.  RR )
Assertion
Ref Expression
suprleubex  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  <_  B  <->  A. z  e.  A  z  <_  B ) )
Distinct variable groups:    x, A, y, z    ph, x    z, B
Allowed substitution hints:    ph( y, z)    B( x, y)

Proof of Theorem suprleubex
Dummy variables  f  g  w are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 lttri3 8355 . . . . . . . 8  |-  ( ( f  e.  RR  /\  g  e.  RR )  ->  ( f  =  g  <-> 
( -.  f  < 
g  /\  -.  g  <  f ) ) )
21adantl 277 . . . . . . 7  |-  ( (
ph  /\  ( f  e.  RR  /\  g  e.  RR ) )  -> 
( f  =  g  <-> 
( -.  f  < 
g  /\  -.  g  <  f ) ) )
3 suprubex.ex . . . . . . 7  |-  ( ph  ->  E. x  e.  RR  ( A. y  e.  A  -.  x  <  y  /\  A. y  e.  RR  (
y  <  x  ->  E. z  e.  A  y  <  z ) ) )
42, 3supclti 7291 . . . . . 6  |-  ( ph  ->  sup ( A ,  RR ,  <  )  e.  RR )
5 suprlubex.b . . . . . 6  |-  ( ph  ->  B  e.  RR )
64, 5lenltd 8393 . . . . 5  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  <_  B  <->  -.  B  <  sup ( A ,  RR ,  <  ) ) )
7 suprubex.ss . . . . . 6  |-  ( ph  ->  A  C_  RR )
83, 7, 5suprnubex 9229 . . . . 5  |-  ( ph  ->  ( -.  B  <  sup ( A ,  RR ,  <  )  <->  A. z  e.  A  -.  B  <  z ) )
96, 8bitrd 188 . . . 4  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  <_  B  <->  A. z  e.  A  -.  B  <  z ) )
10 breq2 4115 . . . . . 6  |-  ( w  =  z  ->  ( B  <  w  <->  B  <  z ) )
1110notbid 673 . . . . 5  |-  ( w  =  z  ->  ( -.  B  <  w  <->  -.  B  <  z ) )
1211cbvralv 2780 . . . 4  |-  ( A. w  e.  A  -.  B  <  w  <->  A. z  e.  A  -.  B  <  z )
139, 12bitr4di 198 . . 3  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  <_  B  <->  A. w  e.  A  -.  B  <  w ) )
147sselda 3240 . . . . 5  |-  ( (
ph  /\  w  e.  A )  ->  w  e.  RR )
155adantr 276 . . . . 5  |-  ( (
ph  /\  w  e.  A )  ->  B  e.  RR )
1614, 15lenltd 8393 . . . 4  |-  ( (
ph  /\  w  e.  A )  ->  (
w  <_  B  <->  -.  B  <  w ) )
1716ralbidva 2540 . . 3  |-  ( ph  ->  ( A. w  e.  A  w  <_  B  <->  A. w  e.  A  -.  B  <  w ) )
1813, 17bitr4d 191 . 2  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  <_  B  <->  A. w  e.  A  w  <_  B ) )
19 breq1 4114 . . 3  |-  ( w  =  z  ->  (
w  <_  B  <->  z  <_  B ) )
2019cbvralv 2780 . 2  |-  ( A. w  e.  A  w  <_  B  <->  A. z  e.  A  z  <_  B )
2118, 20bitrdi 196 1  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  <_  B  <->  A. z  e.  A  z  <_  B ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    e. wcel 2205   A.wral 2522   E.wrex 2523    C_ wss 3213   class class class wbr 4111   supcsup 7275   RRcr 8128    < clt 8310    <_ cle 8311
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-sep 4230  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-setind 4661  ax-cnex 8220  ax-resscn 8221  ax-pre-ltirr 8241  ax-pre-ltwlin 8242  ax-pre-lttrn 8243  ax-pre-apti 8244
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3045  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-br 4112  df-opab 4174  df-po 4419  df-iso 4420  df-xp 4757  df-cnv 4759  df-iota 5314  df-riota 6005  df-sup 7277  df-pnf 8312  df-mnf 8313  df-xr 8314  df-ltxr 8315  df-le 8316
This theorem is referenced by:  suprzclex  9679  suplociccex  15507
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