Theorem eqord1 8238

Description: A strictly increasing real function on a subset of RR is one-to-one. (Contributed by Mario Carneiro, 14-Jun-2014.) (Revised by Jim Kingdon, 20-Dec-2022.)

Hypotheses

Ref	Expression
ltord.1	|- ( x = y -> A = B )
ltord.2	|- ( x = C -> A = M )
ltord.3	|- ( x = D -> A = N )
ltord.4	|- S C_ RR
ltord.5	|- ( ( ph /\ x e. S ) -> A e. RR )
ltord.6	|- ( ( ph /\ ( x e. S /\ y e. S ) ) -> ( x < y -> A < B ) )

Assertion

Ref	Expression
eqord1	|- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( C = D <-> M = N ) )

Distinct variable groups:   x, B   x, y, C   x, D, y   x, M, y   x, N, y   ph, x, y   x, S, y

Allowed substitution hints:   A( x, y)   B( y)

Proof of Theorem eqord1

Step	Hyp	Ref	Expression
1		simprl 520	. . . . . 6 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> C e. S )
2		elisset 2695	. . . . . 6 |- ( C e. S -> E. x x = C )
3	1, 2	syl 14	. . . . 5 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> E. x x = C )
4	3	adantr 274	. . . 4 |- ( ( ( ph /\ ( C e. S /\ D e. S ) ) /\ C = D ) -> E. x x = C )
5		ltord.2	. . . . . 6 |- ( x = C -> A = M )
6	5	adantl 275	. . . . 5 |- ( ( ( ( ph /\ ( C e. S /\ D e. S ) ) /\ C = D ) /\ x = C ) -> A = M )
7		eqeq2 2147	. . . . . . . 8 |- ( C = D -> ( x = C <-> x = D ) )
8	7	adantl 275	. . . . . . 7 |- ( ( ( ph /\ ( C e. S /\ D e. S ) ) /\ C = D ) -> ( x = C <-> x = D ) )
9	8	biimpa 294	. . . . . 6 |- ( ( ( ( ph /\ ( C e. S /\ D e. S ) ) /\ C = D ) /\ x = C ) -> x = D )
10		ltord.3	. . . . . 6 |- ( x = D -> A = N )
11	9, 10	syl 14	. . . . 5 |- ( ( ( ( ph /\ ( C e. S /\ D e. S ) ) /\ C = D ) /\ x = C ) -> A = N )
12	6, 11	eqtr3d 2172	. . . 4 |- ( ( ( ( ph /\ ( C e. S /\ D e. S ) ) /\ C = D ) /\ x = C ) -> M = N )
13	4, 12	exlimddv 1870	. . 3 |- ( ( ( ph /\ ( C e. S /\ D e. S ) ) /\ C = D ) -> M = N )
14	13	ex 114	. 2 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( C = D -> M = N ) )
15		ltord.1	. . . . . 6 |- ( x = y -> A = B )
16		ltord.4	. . . . . 6 |- S C_ RR
17		ltord.5	. . . . . 6 |- ( ( ph /\ x e. S ) -> A e. RR )
18		ltord.6	. . . . . 6 |- ( ( ph /\ ( x e. S /\ y e. S ) ) -> ( x < y -> A < B ) )
19	15, 5, 10, 16, 17, 18	ltordlem 8237	. . . . 5 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( C < D -> M < N ) )
20	19	con3d 620	. . . 4 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( -. M < N -> -. C < D ) )
21	15, 10, 5, 16, 17, 18	ltordlem 8237	. . . . . 6 |- ( ( ph /\ ( D e. S /\ C e. S ) ) -> ( D < C -> N < M ) )
22	21	con3d 620	. . . . 5 |- ( ( ph /\ ( D e. S /\ C e. S ) ) -> ( -. N < M -> -. D < C ) )
23	22	ancom2s 555	. . . 4 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( -. N < M -> -. D < C ) )
24	20, 23	anim12d 333	. . 3 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( ( -. M < N /\ -. N < M ) -> ( -. C < D /\ -. D < C ) ) )
25	17	ralrimiva 2503	. . . . . 6 |- ( ph -> A. x e. S A e. RR )
26	5	eleq1d 2206	. . . . . . 7 |- ( x = C -> ( A e. RR <-> M e. RR ) )
27	26	rspccva 2783	. . . . . 6 |- ( ( A. x e. S A e. RR /\ C e. S ) -> M e. RR )
28	25, 27	sylan 281	. . . . 5 |- ( ( ph /\ C e. S ) -> M e. RR )
29	28	adantrr 470	. . . 4 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> M e. RR )
30	10	eleq1d 2206	. . . . . . 7 |- ( x = D -> ( A e. RR <-> N e. RR ) )
31	30	rspccva 2783	. . . . . 6 |- ( ( A. x e. S A e. RR /\ D e. S ) -> N e. RR )
32	25, 31	sylan 281	. . . . 5 |- ( ( ph /\ D e. S ) -> N e. RR )
33	32	adantrl 469	. . . 4 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> N e. RR )
34	29, 33	lttri3d 7871	. . 3 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( M = N <-> ( -. M < N /\ -. N < M ) ) )
35	16, 1	sseldi 3090	. . . 4 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> C e. RR )
36		simprr 521	. . . . 5 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> D e. S )
37	16, 36	sseldi 3090	. . . 4 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> D e. RR )
38	35, 37	lttri3d 7871	. . 3 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( C = D <-> ( -. C < D /\ -. D < C ) ) )
39	24, 34, 38	3imtr4d 202	. 2 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( M = N -> C = D ) )
40	14, 39	impbid 128	1 |- ( ( ph /\ ( C e. S /\ D e. S ) ) -> ( C = D <-> M = N ) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 103   <-> wb 104   = wceq 1331   E.wex 1468   e. wcel 1480   A.wral 2414   C_ wss 3066   class class class wbr 3924   RRcr 7612   < clt 7793

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119  ax-sep 4041  ax-pow 4093  ax-pr 4126  ax-un 4350  ax-setind 4447  ax-cnex 7704  ax-resscn 7705  ax-pre-ltirr 7725  ax-pre-apti 7728

This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-fal 1337  df-nf 1437  df-sb 1736  df-eu 2000  df-mo 2001  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-ne 2307  df-nel 2402  df-ral 2419  df-rex 2420  df-rab 2423  df-v 2683  df-dif 3068  df-un 3070  df-in 3072  df-ss 3079  df-pw 3507  df-sn 3528  df-pr 3529  df-op 3531  df-uni 3732  df-br 3925  df-opab 3985  df-xp 4540  df-pnf 7795  df-mnf 7796  df-ltxr 7798

This theorem is referenced by:  eqord2  8239  reef11  11395