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Theorem eqsuptid 6999
Description: Sufficient condition for an element to be equal to the supremum. (Contributed by Jim Kingdon, 24-Nov-2021.)
Hypotheses
Ref Expression
supmoti.ti  |-  ( (
ph  /\  ( u  e.  A  /\  v  e.  A ) )  -> 
( u  =  v  <-> 
( -.  u R v  /\  -.  v R u ) ) )
eqsuptid.2  |-  ( ph  ->  C  e.  A )
eqsuptid.3  |-  ( (
ph  /\  y  e.  B )  ->  -.  C R y )
eqsuptid.4  |-  ( (
ph  /\  ( y  e.  A  /\  y R C ) )  ->  E. z  e.  B  y R z )
Assertion
Ref Expression
eqsuptid  |-  ( ph  ->  sup ( B ,  A ,  R )  =  C )
Distinct variable groups:    u, A, v, y, z    y, B, z    u, R, v, y, z    ph, u, v, y    y, C, u, v    u, B, v, z    ph, y
Allowed substitution hints:    ph( z)    C( z)

Proof of Theorem eqsuptid
StepHypRef Expression
1 eqsuptid.2 . 2  |-  ( ph  ->  C  e.  A )
2 eqsuptid.3 . . 3  |-  ( (
ph  /\  y  e.  B )  ->  -.  C R y )
32ralrimiva 2550 . 2  |-  ( ph  ->  A. y  e.  B  -.  C R y )
4 eqsuptid.4 . . . 4  |-  ( (
ph  /\  ( y  e.  A  /\  y R C ) )  ->  E. z  e.  B  y R z )
54expr 375 . . 3  |-  ( (
ph  /\  y  e.  A )  ->  (
y R C  ->  E. z  e.  B  y R z ) )
65ralrimiva 2550 . 2  |-  ( ph  ->  A. y  e.  A  ( y R C  ->  E. z  e.  B  y R z ) )
7 supmoti.ti . . 3  |-  ( (
ph  /\  ( u  e.  A  /\  v  e.  A ) )  -> 
( u  =  v  <-> 
( -.  u R v  /\  -.  v R u ) ) )
87eqsupti 6998 . 2  |-  ( ph  ->  ( ( C  e.  A  /\  A. y  e.  B  -.  C R y  /\  A. y  e.  A  (
y R C  ->  E. z  e.  B  y R z ) )  ->  sup ( B ,  A ,  R )  =  C ) )
91, 3, 6, 8mp3and 1340 1  |-  ( ph  ->  sup ( B ,  A ,  R )  =  C )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    = wceq 1353    e. wcel 2148   A.wral 2455   E.wrex 2456   class class class wbr 4005   supcsup 6984
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 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-ext 2159
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-reu 2462  df-rmo 2463  df-rab 2464  df-v 2741  df-sbc 2965  df-un 3135  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-br 4006  df-iota 5180  df-riota 5834  df-sup 6986
This theorem is referenced by:  supmaxti  7006  supisoti  7012  xrmaxaddlem  11271  dfgcd2  12018
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