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Theorem eqsuptid 7327
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 2623 . 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 2623 . 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 7326 . 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 1381 1  |-  ( ph  ->  sup ( B ,  A ,  R )  =  C )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    = wceq 1402    e. wcel 2209   A.wral 2528   E.wrex 2529   class class class wbr 4125   supcsup 7312
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-ext 2220
This theorem depends on definitions:  df-bi 117  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-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-un 3224  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-iota 5332  df-riota 6028  df-sup 7314
This theorem is referenced by:  supmaxti  7334  supisoti  7340  xrmaxaddlem  12004  dfgcd2  12769
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