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Theorem dedekindeulemlub 15207
Description: Lemma for dedekindeu 15210. 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 2268 . . . . 5  |-  ( q  =  x  ->  (
q  e.  L  <->  x  e.  L ) )
43cbvrexv 2743 . . . 4  |-  ( E. q  e.  RR  q  e.  L  <->  E. x  e.  RR  x  e.  L )
5 rexex 2554 . . . 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 15205 . 2  |-  ( ph  ->  E. x  e.  RR  A. y  e.  L  y  <  x )
151, 8, 2, 9, 10, 11, 12, 13dedekindeulemloc 15206 . 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 8180 . 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 1251 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 710    = wceq 1373   E.wex 1516    e. wcel 2178   A.wral 2486   E.wrex 2487    i^i cin 3173    C_ wss 3174   (/)c0 3468   class class class wbr 4059   RRcr 7959    < clt 8142
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-un 4498  ax-setind 4603  ax-cnex 8051  ax-resscn 8052  ax-pre-ltwlin 8073  ax-pre-suploc 8081
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-nel 2474  df-ral 2491  df-rex 2492  df-rab 2495  df-v 2778  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-nul 3469  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-br 4060  df-opab 4122  df-xp 4699  df-cnv 4701  df-pnf 8144  df-mnf 8145  df-xr 8146  df-ltxr 8147  df-le 8148
This theorem is referenced by:  dedekindeulemlu  15208
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