Theorem pofun 4067

Description: A function preserves a partial order relation. (Contributed by Jeff Madsen, 18-Jun-2011.)

Hypotheses

Ref	Expression
pofun.1	|- S = { <. x , y >. | X R Y }
pofun.2	|- ( x = y -> X = Y )

Assertion

Ref	Expression
pofun	|- ( ( R Po B /\ A. x e. A X e. B ) -> S Po A )

Distinct variable groups:   x, R, y   y, X   x, Y   x, A   x, B

Allowed substitution hints:   A( y)   B( y)   S( x, y)   X( x)   Y( y)

Proof of Theorem pofun

Dummy variables v w z are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		nfcsb1v 2938	. . . . . . 7 |- F/_ x [_ v / x ]_ X
2	1	nfel1 2229	. . . . . 6 |- F/ x [_ v / x ]_ X e. B
3		csbeq1a 2916	. . . . . . 7 |- ( x = v -> X = [_ v / x ]_ X )
4	3	eleq1d 2147	. . . . . 6 |- ( x = v -> ( X e. B <-> [_ v / x ]_ X e. B ) )
5	2, 4	rspc 2695	. . . . 5 |- ( v e. A -> ( A. x e. A X e. B -> [_ v / x ]_ X e. B ) )
6	5	impcom 123	. . . 4 |- ( ( A. x e. A X e. B /\ v e. A ) -> [_ v / x ]_ X e. B )
7		poirr 4062	. . . . 5 |- ( ( R Po B /\ [_ v / x ]_ X e. B ) -> -. [_ v / x ]_ X R [_ v / x ]_ X )
8		df-br 3786	. . . . . 6 |- ( v S v <-> <. v , v >. e. S )
9		pofun.1	. . . . . . 7 |- S = { <. x , y >. | X R Y }
10	9	eleq2i 2145	. . . . . 6 |- ( <. v , v >. e. S <-> <. v , v >. e. { <. x , y >. | X R Y } )
11		nfcv 2219	. . . . . . . 8 |- F/_ x R
12		nfcv 2219	. . . . . . . 8 |- F/_ x Y
13	1, 11, 12	nfbr 3829	. . . . . . 7 |- F/ x [_ v / x ]_ X R Y
14		nfv 1461	. . . . . . 7 |- F/ y [_ v / x ]_ X R [_ v / x ]_ X
15		vex 2604	. . . . . . 7 |- v e. _V
16	3	breq1d 3795	. . . . . . 7 |- ( x = v -> ( X R Y <-> [_ v / x ]_ X R Y ) )
17		vex 2604	. . . . . . . . . 10 |- y e. _V
18		pofun.2	. . . . . . . . . 10 |- ( x = y -> X = Y )
19	17, 12, 18	csbief 2947	. . . . . . . . 9 |- [_ y / x ]_ X = Y
20		csbeq1 2911	. . . . . . . . 9 |- ( y = v -> [_ y / x ]_ X = [_ v / x ]_ X )
21	19, 20	syl5eqr 2127	. . . . . . . 8 |- ( y = v -> Y = [_ v / x ]_ X )
22	21	breq2d 3797	. . . . . . 7 |- ( y = v -> ( [_ v / x ]_ X R Y <-> [_ v / x ]_ X R [_ v / x ]_ X ) )
23	13, 14, 15, 15, 16, 22	opelopabf 4029	. . . . . 6 |- ( <. v , v >. e. { <. x , y >. | X R Y } <-> [_ v / x ]_ X R [_ v / x ]_ X )
24	8, 10, 23	3bitri 204	. . . . 5 |- ( v S v <-> [_ v / x ]_ X R [_ v / x ]_ X )
25	7, 24	sylnibr 634	. . . 4 |- ( ( R Po B /\ [_ v / x ]_ X e. B ) -> -. v S v )
26	6, 25	sylan2 280	. . 3 |- ( ( R Po B /\ ( A. x e. A X e. B /\ v e. A ) ) -> -. v S v )
27	26	anassrs 392	. 2 |- ( ( ( R Po B /\ A. x e. A X e. B ) /\ v e. A ) -> -. v S v )
28	5	com12 30	. . . . . 6 |- ( A. x e. A X e. B -> ( v e. A -> [_ v / x ]_ X e. B ) )
29		nfcsb1v 2938	. . . . . . . . 9 |- F/_ x [_ w / x ]_ X
30	29	nfel1 2229	. . . . . . . 8 |- F/ x [_ w / x ]_ X e. B
31		csbeq1a 2916	. . . . . . . . 9 |- ( x = w -> X = [_ w / x ]_ X )
32	31	eleq1d 2147	. . . . . . . 8 |- ( x = w -> ( X e. B <-> [_ w / x ]_ X e. B ) )
33	30, 32	rspc 2695	. . . . . . 7 |- ( w e. A -> ( A. x e. A X e. B -> [_ w / x ]_ X e. B ) )
34	33	com12 30	. . . . . 6 |- ( A. x e. A X e. B -> ( w e. A -> [_ w / x ]_ X e. B ) )
35		nfcsb1v 2938	. . . . . . . . 9 |- F/_ x [_ z / x ]_ X
36	35	nfel1 2229	. . . . . . . 8 |- F/ x [_ z / x ]_ X e. B
37		csbeq1a 2916	. . . . . . . . 9 |- ( x = z -> X = [_ z / x ]_ X )
38	37	eleq1d 2147	. . . . . . . 8 |- ( x = z -> ( X e. B <-> [_ z / x ]_ X e. B ) )
39	36, 38	rspc 2695	. . . . . . 7 |- ( z e. A -> ( A. x e. A X e. B -> [_ z / x ]_ X e. B ) )
40	39	com12 30	. . . . . 6 |- ( A. x e. A X e. B -> ( z e. A -> [_ z / x ]_ X e. B ) )
41	28, 34, 40	3anim123d 1250	. . . . 5 |- ( A. x e. A X e. B -> ( ( v e. A /\ w e. A /\ z e. A ) -> ( [_ v / x ]_ X e. B /\ [_ w / x ]_ X e. B /\ [_ z / x ]_ X e. B ) ) )
42	41	imp 122	. . . 4 |- ( ( A. x e. A X e. B /\ ( v e. A /\ w e. A /\ z e. A ) ) -> ( [_ v / x ]_ X e. B /\ [_ w / x ]_ X e. B /\ [_ z / x ]_ X e. B ) )
43	42	adantll 459	. . 3 |- ( ( ( R Po B /\ A. x e. A X e. B ) /\ ( v e. A /\ w e. A /\ z e. A ) ) -> ( [_ v / x ]_ X e. B /\ [_ w / x ]_ X e. B /\ [_ z / x ]_ X e. B ) )
44		potr 4063	. . . . 5 |- ( ( R Po B /\ ( [_ v / x ]_ X e. B /\ [_ w / x ]_ X e. B /\ [_ z / x ]_ X e. B ) ) -> ( ( [_ v / x ]_ X R [_ w / x ]_ X /\ [_ w / x ]_ X R [_ z / x ]_ X ) -> [_ v / x ]_ X R [_ z / x ]_ X ) )
45		df-br 3786	. . . . . . 7 |- ( v S w <-> <. v , w >. e. S )
46	9	eleq2i 2145	. . . . . . 7 |- ( <. v , w >. e. S <-> <. v , w >. e. { <. x , y >. | X R Y } )
47		nfv 1461	. . . . . . . 8 |- F/ y [_ v / x ]_ X R [_ w / x ]_ X
48		vex 2604	. . . . . . . 8 |- w e. _V
49		csbeq1 2911	. . . . . . . . . 10 |- ( y = w -> [_ y / x ]_ X = [_ w / x ]_ X )
50	19, 49	syl5eqr 2127	. . . . . . . . 9 |- ( y = w -> Y = [_ w / x ]_ X )
51	50	breq2d 3797	. . . . . . . 8 |- ( y = w -> ( [_ v / x ]_ X R Y <-> [_ v / x ]_ X R [_ w / x ]_ X ) )
52	13, 47, 15, 48, 16, 51	opelopabf 4029	. . . . . . 7 |- ( <. v , w >. e. { <. x , y >. | X R Y } <-> [_ v / x ]_ X R [_ w / x ]_ X )
53	45, 46, 52	3bitri 204	. . . . . 6 |- ( v S w <-> [_ v / x ]_ X R [_ w / x ]_ X )
54		df-br 3786	. . . . . . 7 |- ( w S z <-> <. w , z >. e. S )
55	9	eleq2i 2145	. . . . . . 7 |- ( <. w , z >. e. S <-> <. w , z >. e. { <. x , y >. | X R Y } )
56	29, 11, 12	nfbr 3829	. . . . . . . 8 |- F/ x [_ w / x ]_ X R Y
57		nfv 1461	. . . . . . . 8 |- F/ y [_ w / x ]_ X R [_ z / x ]_ X
58		vex 2604	. . . . . . . 8 |- z e. _V
59	31	breq1d 3795	. . . . . . . 8 |- ( x = w -> ( X R Y <-> [_ w / x ]_ X R Y ) )
60		csbeq1 2911	. . . . . . . . . 10 |- ( y = z -> [_ y / x ]_ X = [_ z / x ]_ X )
61	19, 60	syl5eqr 2127	. . . . . . . . 9 |- ( y = z -> Y = [_ z / x ]_ X )
62	61	breq2d 3797	. . . . . . . 8 |- ( y = z -> ( [_ w / x ]_ X R Y <-> [_ w / x ]_ X R [_ z / x ]_ X ) )
63	56, 57, 48, 58, 59, 62	opelopabf 4029	. . . . . . 7 |- ( <. w , z >. e. { <. x , y >. | X R Y } <-> [_ w / x ]_ X R [_ z / x ]_ X )
64	54, 55, 63	3bitri 204	. . . . . 6 |- ( w S z <-> [_ w / x ]_ X R [_ z / x ]_ X )
65	53, 64	anbi12i 447	. . . . 5 |- ( ( v S w /\ w S z ) <-> ( [_ v / x ]_ X R [_ w / x ]_ X /\ [_ w / x ]_ X R [_ z / x ]_ X ) )
66		df-br 3786	. . . . . 6 |- ( v S z <-> <. v , z >. e. S )
67	9	eleq2i 2145	. . . . . 6 |- ( <. v , z >. e. S <-> <. v , z >. e. { <. x , y >. | X R Y } )
68		nfv 1461	. . . . . . 7 |- F/ y [_ v / x ]_ X R [_ z / x ]_ X
69	61	breq2d 3797	. . . . . . 7 |- ( y = z -> ( [_ v / x ]_ X R Y <-> [_ v / x ]_ X R [_ z / x ]_ X ) )
70	13, 68, 15, 58, 16, 69	opelopabf 4029	. . . . . 6 |- ( <. v , z >. e. { <. x , y >. | X R Y } <-> [_ v / x ]_ X R [_ z / x ]_ X )
71	66, 67, 70	3bitri 204	. . . . 5 |- ( v S z <-> [_ v / x ]_ X R [_ z / x ]_ X )
72	44, 65, 71	3imtr4g 203	. . . 4 |- ( ( R Po B /\ ( [_ v / x ]_ X e. B /\ [_ w / x ]_ X e. B /\ [_ z / x ]_ X e. B ) ) -> ( ( v S w /\ w S z ) -> v S z ) )
73	72	adantlr 460	. . 3 |- ( ( ( R Po B /\ A. x e. A X e. B ) /\ ( [_ v / x ]_ X e. B /\ [_ w / x ]_ X e. B /\ [_ z / x ]_ X e. B ) ) -> ( ( v S w /\ w S z ) -> v S z ) )
74	43, 73	syldan 276	. 2 |- ( ( ( R Po B /\ A. x e. A X e. B ) /\ ( v e. A /\ w e. A /\ z e. A ) ) -> ( ( v S w /\ w S z ) -> v S z ) )
75	27, 74	ispod 4059	1 |- ( ( R Po B /\ A. x e. A X e. B ) -> S Po A )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 102   /\ w3a 919   = wceq 1284   e. wcel 1433   A.wral 2348   [_csb 2908   <.cop 3401   class class class wbr 3785   {copab 3838   Po wpo 4049

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 576  ax-in2 577  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-14 1445  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063  ax-sep 3896  ax-pow 3948  ax-pr 3964

This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-eu 1944  df-mo 1945  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-rex 2354  df-v 2603  df-sbc 2816  df-csb 2909  df-un 2977  df-in 2979  df-ss 2986  df-pw 3384  df-sn 3404  df-pr 3405  df-op 3407  df-br 3786  df-opab 3840  df-po 4051

This theorem is referenced by: (None)