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Theorem infsnti 6832
Description: The infimum of a singleton. (Contributed by Jim Kingdon, 19-Dec-2021.)
Hypotheses
Ref Expression
infsnti.ti  |-  ( (
ph  /\  ( u  e.  A  /\  v  e.  A ) )  -> 
( u  =  v  <-> 
( -.  u R v  /\  -.  v R u ) ) )
infsnti.b  |-  ( ph  ->  B  e.  A )
Assertion
Ref Expression
infsnti  |-  ( ph  -> inf ( { B } ,  A ,  R )  =  B )
Distinct variable groups:    u, A, v   
u, B, v    u, R, v    ph, u, v

Proof of Theorem infsnti
StepHypRef Expression
1 df-inf 6787 . 2  |- inf ( { B } ,  A ,  R )  =  sup ( { B } ,  A ,  `' R
)
2 infsnti.ti . . . 4  |-  ( (
ph  /\  ( u  e.  A  /\  v  e.  A ) )  -> 
( u  =  v  <-> 
( -.  u R v  /\  -.  v R u ) ) )
32cnvti 6821 . . 3  |-  ( (
ph  /\  ( u  e.  A  /\  v  e.  A ) )  -> 
( u  =  v  <-> 
( -.  u `' R v  /\  -.  v `' R u ) ) )
4 infsnti.b . . 3  |-  ( ph  ->  B  e.  A )
53, 4supsnti 6807 . 2  |-  ( ph  ->  sup ( { B } ,  A ,  `' R )  =  B )
61, 5syl5eq 2144 1  |-  ( ph  -> inf ( { B } ,  A ,  R )  =  B )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 103    <-> wb 104    = wceq 1299    e. wcel 1448   {csn 3474   class class class wbr 3875   `'ccnv 4476   supcsup 6784  infcinf 6785
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 584  ax-in2 585  ax-io 671  ax-5 1391  ax-7 1392  ax-gen 1393  ax-ie1 1437  ax-ie2 1438  ax-8 1450  ax-10 1451  ax-11 1452  ax-i12 1453  ax-bndl 1454  ax-4 1455  ax-14 1460  ax-17 1474  ax-i9 1478  ax-ial 1482  ax-i5r 1483  ax-ext 2082  ax-sep 3986  ax-pow 4038  ax-pr 4069
This theorem depends on definitions:  df-bi 116  df-3an 932  df-tru 1302  df-fal 1305  df-nf 1405  df-sb 1704  df-eu 1963  df-mo 1964  df-clab 2087  df-cleq 2093  df-clel 2096  df-nfc 2229  df-ral 2380  df-rex 2381  df-reu 2382  df-rmo 2383  df-rab 2384  df-v 2643  df-sbc 2863  df-un 3025  df-in 3027  df-ss 3034  df-pw 3459  df-sn 3480  df-pr 3481  df-op 3483  df-uni 3684  df-br 3876  df-opab 3930  df-cnv 4485  df-iota 5024  df-riota 5662  df-sup 6786  df-inf 6787
This theorem is referenced by: (None)
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