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Theorem dedekindeulemlub 14774
Description: Lemma for dedekindeu 14777. The set L has a least upper bound. (Contributed by Jim Kingdon, 31-Jan-2024.)
Hypotheses
Ref Expression
dedekindeu.lss  |-  ( ph  ->  L  C_  RR )
dedekindeu.uss  |-  ( ph  ->  U  C_  RR )
dedekindeu.lm  |-  ( ph  ->  E. q  e.  RR  q  e.  L )
dedekindeu.um  |-  ( ph  ->  E. r  e.  RR  r  e.  U )
dedekindeu.lr  |-  ( ph  ->  A. q  e.  RR  ( q  e.  L  <->  E. r  e.  L  q  <  r ) )
dedekindeu.ur  |-  ( ph  ->  A. r  e.  RR  ( r  e.  U  <->  E. q  e.  U  q  <  r ) )
dedekindeu.disj  |-  ( ph  ->  ( L  i^i  U
)  =  (/) )
dedekindeu.loc  |-  ( ph  ->  A. q  e.  RR  A. r  e.  RR  (
q  <  r  ->  ( q  e.  L  \/  r  e.  U )
) )
Assertion
Ref Expression
dedekindeulemlub  |-  ( ph  ->  E. x  e.  RR  ( A. y  e.  L  -.  x  <  y  /\  A. y  e.  RR  (
y  <  x  ->  E. z  e.  L  y  <  z ) ) )
Distinct variable groups:    L, q, r, x, y, z    U, q, r, y, z    ph, q,
r, x, y, z
Allowed substitution hint:    U( x)

Proof of Theorem dedekindeulemlub
StepHypRef Expression
1 dedekindeu.lss . 2  |-  ( ph  ->  L  C_  RR )
2 dedekindeu.lm . . 3  |-  ( ph  ->  E. q  e.  RR  q  e.  L )
3 eleq1w 2254 . . . . 5  |-  ( q  =  x  ->  (
q  e.  L  <->  x  e.  L ) )
43cbvrexv 2727 . . . 4  |-  ( E. q  e.  RR  q  e.  L  <->  E. x  e.  RR  x  e.  L )
5 rexex 2540 . . . 4  |-  ( E. x  e.  RR  x  e.  L  ->  E. x  x  e.  L )
64, 5sylbi 121 . . 3  |-  ( E. q  e.  RR  q  e.  L  ->  E. x  x  e.  L )
72, 6syl 14 . 2  |-  ( ph  ->  E. x  x  e.  L )
8 dedekindeu.uss . . 3  |-  ( ph  ->  U  C_  RR )
9 dedekindeu.um . . 3  |-  ( ph  ->  E. r  e.  RR  r  e.  U )
10 dedekindeu.lr . . 3  |-  ( ph  ->  A. q  e.  RR  ( q  e.  L  <->  E. r  e.  L  q  <  r ) )
11 dedekindeu.ur . . 3  |-  ( ph  ->  A. r  e.  RR  ( r  e.  U  <->  E. q  e.  U  q  <  r ) )
12 dedekindeu.disj . . 3  |-  ( ph  ->  ( L  i^i  U
)  =  (/) )
13 dedekindeu.loc . . 3  |-  ( ph  ->  A. q  e.  RR  A. r  e.  RR  (
q  <  r  ->  ( q  e.  L  \/  r  e.  U )
) )
141, 8, 2, 9, 10, 11, 12, 13dedekindeulemub 14772 . 2  |-  ( ph  ->  E. x  e.  RR  A. y  e.  L  y  <  x )
151, 8, 2, 9, 10, 11, 12, 13dedekindeulemloc 14773 . 2  |-  ( ph  ->  A. x  e.  RR  A. y  e.  RR  (
x  <  y  ->  ( E. z  e.  L  x  <  z  \/  A. z  e.  L  z  <  y ) ) )
16 axsuploc 8092 . 2  |-  ( ( ( L  C_  RR  /\ 
E. x  x  e.  L )  /\  ( E. x  e.  RR  A. y  e.  L  y  <  x  /\  A. x  e.  RR  A. y  e.  RR  ( x  < 
y  ->  ( E. z  e.  L  x  <  z  \/  A. z  e.  L  z  <  y ) ) ) )  ->  E. x  e.  RR  ( A. y  e.  L  -.  x  <  y  /\  A. y  e.  RR  (
y  <  x  ->  E. z  e.  L  y  <  z ) ) )
171, 7, 14, 15, 16syl22anc 1250 1  |-  ( ph  ->  E. x  e.  RR  ( A. y  e.  L  -.  x  <  y  /\  A. y  e.  RR  (
y  <  x  ->  E. z  e.  L  y  <  z ) ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 104    <-> wb 105    \/ wo 709    = wceq 1364   E.wex 1503    e. wcel 2164   A.wral 2472   E.wrex 2473    i^i cin 3152    C_ wss 3153   (/)c0 3446   class class class wbr 4029   RRcr 7871    < clt 8054
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 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238  ax-un 4464  ax-setind 4569  ax-cnex 7963  ax-resscn 7964  ax-pre-ltwlin 7985  ax-pre-suploc 7993
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-nel 2460  df-ral 2477  df-rex 2478  df-rab 2481  df-v 2762  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3447  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-br 4030  df-opab 4091  df-xp 4665  df-cnv 4667  df-pnf 8056  df-mnf 8057  df-xr 8058  df-ltxr 8059  df-le 8060
This theorem is referenced by:  dedekindeulemlu  14775
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