Theorem dedekindeulemlub 15644

Description: Lemma for dedekindeu 15647. 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

Step	Hyp	Ref	Expression
1		dedekindeu.lss	. 2 |- ( ph -> L C_ RR )
2		dedekindeu.lm	. . 3 |- ( ph -> E. q e. RR q e. L )
3		eleq1w 2299	. . . . 5 |- ( q = x -> ( q e. L <-> x e. L ) )
4	3	cbvrexv 2787	. . . 4 |- ( E. q e. RR q e. L <-> E. x e. RR x e. L )
5		rexex 2596	. . . 4 |- ( E. x e. RR x e. L -> E. x x e. L )
6	4, 5	sylbi 121	. . 3 |- ( E. q e. RR q e. L -> E. x x e. L )
7	2, 6	syl 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 ) ) )
14	1, 8, 2, 9, 10, 11, 12, 13	dedekindeulemub 15642	. 2 |- ( ph -> E. x e. RR A. y e. L y < x )
15	1, 8, 2, 9, 10, 11, 12, 13	dedekindeulemloc 15643	. 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 8388	. 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 ) ) )
17	1, 7, 14, 15, 16	syl22anc 1279	1 |- ( ph -> E. x e. RR ( A. y e. L -. x < y /\ A. y e. RR ( y < x -> E. z e. L y < z ) ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   \/ wo 720   = wceq 1402   E.wex 1545   e. wcel 2209   A.wral 2528   E.wrex 2529   i^i cin 3219   C_ wss 3220   (/)c0 3520   class class class wbr 4125   RRcr 8168   < clt 8350

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-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573  ax-setind 4679  ax-cnex 8260  ax-resscn 8261  ax-pre-ltwlin 8282  ax-pre-suploc 8290

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-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-xp 4775  df-cnv 4777  df-pnf 8352  df-mnf 8353  df-xr 8354  df-ltxr 8355  df-le 8356

This theorem is referenced by:  dedekindeulemlu  15645