Theorem comfeq 14961

Description: Condition for two categories with the same hom-sets to have the same composition. (Contributed by Mario Carneiro, 4-Jan-2017.)

Hypotheses

Ref	Expression
comfeq.1	|- .x. = (comp ` C )
comfeq.2	|- .xb = (comp ` D )
comfeq.h	|- H = ( Hom ` C )
comfeq.3	|- ( ph -> B = ( Base ` C ) )
comfeq.4	|- ( ph -> B = ( Base ` D ) )
comfeq.5	|- ( ph -> ( Hom f ` C ) = ( Hom f ` D ) )

Assertion

Ref	Expression
comfeq	|- ( ph -> ( (compf ` C ) = (compf ` D ) <-> A. x e. B A. y e. B A. z e. B A. f e. ( x H y ) A. g e. ( y H z ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) ) )

Distinct variable groups:   f, g, x, y, z, B   C, f, g, z   ph, f, g, z   .x. , f, g, x, y   D, f, g, z   f, H, g, x, y   .xb , f, g, x, y

Allowed substitution hints:   ph( x, y)   C( x, y)   D( x, y)   .xb ( z)   .x. ( z)   H( z)

Proof of Theorem comfeq

Dummy variable u is distinct from all other variables.

Step	Hyp	Ref	Expression
1		ovex 6308	. . . . . 6 |- ( ( 2nd ` u ) H z ) e. _V
2		fvex 5875	. . . . . 6 |- ( H ` u ) e. _V
3	1, 2	mpt2ex 6860	. . . . 5 |- ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) e. _V
4	3	rgen2w 2826	. . . 4 |- A. u e. ( B X. B ) A. z e. B ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) e. _V
5		mpt22eqb 6394	. . . 4 |- ( A. u e. ( B X. B ) A. z e. B ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) e. _V -> ( ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) ) = ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) ) <-> A. u e. ( B X. B ) A. z e. B ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) = ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) ) )
6	4, 5	ax-mp 5	. . 3 |- ( ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) ) = ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) ) <-> A. u e. ( B X. B ) A. z e. B ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) = ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) )
7		vex 3116	. . . . . . . . 9 |- x e. _V
8		vex 3116	. . . . . . . . 9 |- y e. _V
9	7, 8	op2ndd 6795	. . . . . . . 8 |- ( u = <. x , y >. -> ( 2nd ` u ) = y )
10	9	oveq1d 6298	. . . . . . 7 |- ( u = <. x , y >. -> ( ( 2nd ` u ) H z ) = ( y H z ) )
11		fveq2 5865	. . . . . . . . 9 |- ( u = <. x , y >. -> ( H ` u ) = ( H ` <. x , y >. ) )
12		df-ov 6286	. . . . . . . . 9 |- ( x H y ) = ( H ` <. x , y >. )
13	11, 12	syl6eqr 2526	. . . . . . . 8 |- ( u = <. x , y >. -> ( H ` u ) = ( x H y ) )
14		oveq1 6290	. . . . . . . . . 10 |- ( u = <. x , y >. -> ( u .x. z ) = ( <. x , y >. .x. z ) )
15	14	oveqd 6300	. . . . . . . . 9 |- ( u = <. x , y >. -> ( g ( u .x. z ) f ) = ( g ( <. x , y >. .x. z ) f ) )
16		oveq1 6290	. . . . . . . . . 10 |- ( u = <. x , y >. -> ( u .xb z ) = ( <. x , y >. .xb z ) )
17	16	oveqd 6300	. . . . . . . . 9 |- ( u = <. x , y >. -> ( g ( u .xb z ) f ) = ( g ( <. x , y >. .xb z ) f ) )
18	15, 17	eqeq12d 2489	. . . . . . . 8 |- ( u = <. x , y >. -> ( ( g ( u .x. z ) f ) = ( g ( u .xb z ) f ) <-> ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) ) )
19	13, 18	raleqbidv 3072	. . . . . . 7 |- ( u = <. x , y >. -> ( A. f e. ( H ` u ) ( g ( u .x. z ) f ) = ( g ( u .xb z ) f ) <-> A. f e. ( x H y ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) ) )
20	10, 19	raleqbidv 3072	. . . . . 6 |- ( u = <. x , y >. -> ( A. g e. ( ( 2nd ` u ) H z ) A. f e. ( H ` u ) ( g ( u .x. z ) f ) = ( g ( u .xb z ) f ) <-> A. g e. ( y H z ) A. f e. ( x H y ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) ) )
21		ovex 6308	. . . . . . . 8 |- ( g ( u .x. z ) f ) e. _V
22	21	rgen2w 2826	. . . . . . 7 |- A. g e. ( ( 2nd ` u ) H z ) A. f e. ( H ` u ) ( g ( u .x. z ) f ) e. _V
23		mpt22eqb 6394	. . . . . . 7 |- ( A. g e. ( ( 2nd ` u ) H z ) A. f e. ( H ` u ) ( g ( u .x. z ) f ) e. _V -> ( ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) = ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) <-> A. g e. ( ( 2nd ` u ) H z ) A. f e. ( H ` u ) ( g ( u .x. z ) f ) = ( g ( u .xb z ) f ) ) )
24	22, 23	ax-mp 5	. . . . . 6 |- ( ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) = ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) <-> A. g e. ( ( 2nd ` u ) H z ) A. f e. ( H ` u ) ( g ( u .x. z ) f ) = ( g ( u .xb z ) f ) )
25		ralcom 3022	. . . . . 6 |- ( A. f e. ( x H y ) A. g e. ( y H z ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) <-> A. g e. ( y H z ) A. f e. ( x H y ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) )
26	20, 24, 25	3bitr4g 288	. . . . 5 |- ( u = <. x , y >. -> ( ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) = ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) <-> A. f e. ( x H y ) A. g e. ( y H z ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) ) )
27	26	ralbidv 2903	. . . 4 |- ( u = <. x , y >. -> ( A. z e. B ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) = ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) <-> A. z e. B A. f e. ( x H y ) A. g e. ( y H z ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) ) )
28	27	ralxp 5143	. . 3 |- ( A. u e. ( B X. B ) A. z e. B ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) = ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) <-> A. x e. B A. y e. B A. z e. B A. f e. ( x H y ) A. g e. ( y H z ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) )
29	6, 28	bitri 249	. 2 |- ( ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) ) = ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) ) <-> A. x e. B A. y e. B A. z e. B A. f e. ( x H y ) A. g e. ( y H z ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) )
30		comfeq.3	. . . . . 6 |- ( ph -> B = ( Base ` C ) )
31	30, 30	xpeq12d 5024	. . . . 5 |- ( ph -> ( B X. B ) = ( ( Base ` C ) X. ( Base ` C ) ) )
32		eqidd 2468	. . . . 5 |- ( ph -> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) = ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) )
33	31, 30, 32	mpt2eq123dv 6342	. . . 4 |- ( ph -> ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) ) = ( u e. ( ( Base ` C ) X. ( Base ` C ) ) , z e. ( Base ` C ) |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) ) )
34		eqid 2467	. . . . 5 |- (compf ` C ) = (compf ` C )
35		eqid 2467	. . . . 5 |- ( Base ` C ) = ( Base ` C )
36		comfeq.h	. . . . 5 |- H = ( Hom ` C )
37		comfeq.1	. . . . 5 |- .x. = (comp ` C )
38	34, 35, 36, 37	comfffval 14953	. . . 4 |- (compf ` C ) = ( u e. ( ( Base ` C ) X. ( Base ` C ) ) , z e. ( Base ` C ) |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) )
39	33, 38	syl6eqr 2526	. . 3 |- ( ph -> ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) ) = (compf ` C ) )
40		eqid 2467	. . . . . . . 8 |- ( Hom ` D ) = ( Hom ` D )
41		comfeq.5	. . . . . . . . 9 |- ( ph -> ( Hom f ` C ) = ( Hom f ` D ) )
42	41	3ad2ant1 1017	. . . . . . . 8 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( Hom f ` C ) = ( Hom f ` D ) )
43		xp2nd 6815	. . . . . . . . . 10 |- ( u e. ( B X. B ) -> ( 2nd ` u ) e. B )
44	43	3ad2ant2 1018	. . . . . . . . 9 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( 2nd ` u ) e. B )
45	30	3ad2ant1 1017	. . . . . . . . 9 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> B = ( Base ` C ) )
46	44, 45	eleqtrd 2557	. . . . . . . 8 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( 2nd ` u ) e. ( Base ` C ) )
47		simp3 998	. . . . . . . . 9 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> z e. B )
48	47, 45	eleqtrd 2557	. . . . . . . 8 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> z e. ( Base ` C ) )
49	35, 36, 40, 42, 46, 48	homfeqval 14952	. . . . . . 7 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( ( 2nd ` u ) H z ) = ( ( 2nd ` u ) ( Hom ` D ) z ) )
50		xp1st 6814	. . . . . . . . . . . 12 |- ( u e. ( B X. B ) -> ( 1st ` u ) e. B )
51	50	3ad2ant2 1018	. . . . . . . . . . 11 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( 1st ` u ) e. B )
52	51, 45	eleqtrd 2557	. . . . . . . . . 10 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( 1st ` u ) e. ( Base ` C ) )
53	35, 36, 40, 42, 52, 46	homfeqval 14952	. . . . . . . . 9 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( ( 1st ` u ) H ( 2nd ` u ) ) = ( ( 1st ` u ) ( Hom ` D ) ( 2nd ` u ) ) )
54		df-ov 6286	. . . . . . . . 9 |- ( ( 1st ` u ) H ( 2nd ` u ) ) = ( H ` <. ( 1st ` u ) , ( 2nd ` u ) >. )
55		df-ov 6286	. . . . . . . . 9 |- ( ( 1st ` u ) ( Hom ` D ) ( 2nd ` u ) ) = ( ( Hom ` D ) ` <. ( 1st ` u ) , ( 2nd ` u ) >. )
56	53, 54, 55	3eqtr3g 2531	. . . . . . . 8 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( H ` <. ( 1st ` u ) , ( 2nd ` u ) >. ) = ( ( Hom ` D ) ` <. ( 1st ` u ) , ( 2nd ` u ) >. ) )
57		1st2nd2 6821	. . . . . . . . . 10 |- ( u e. ( B X. B ) -> u = <. ( 1st ` u ) , ( 2nd ` u ) >. )
58	57	3ad2ant2 1018	. . . . . . . . 9 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> u = <. ( 1st ` u ) , ( 2nd ` u ) >. )
59	58	fveq2d 5869	. . . . . . . 8 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( H ` u ) = ( H ` <. ( 1st ` u ) , ( 2nd ` u ) >. ) )
60	58	fveq2d 5869	. . . . . . . 8 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( ( Hom ` D ) ` u ) = ( ( Hom ` D ) ` <. ( 1st ` u ) , ( 2nd ` u ) >. ) )
61	56, 59, 60	3eqtr4d 2518	. . . . . . 7 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( H ` u ) = ( ( Hom ` D ) ` u ) )
62		eqidd 2468	. . . . . . 7 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( g ( u .xb z ) f ) = ( g ( u .xb z ) f ) )
63	49, 61, 62	mpt2eq123dv 6342	. . . . . 6 |- ( ( ph /\ u e. ( B X. B ) /\ z e. B ) -> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) = ( g e. ( ( 2nd ` u ) ( Hom ` D ) z ) , f e. ( ( Hom ` D ) ` u ) |-> ( g ( u .xb z ) f ) ) )
64	63	mpt2eq3dva 6344	. . . . 5 |- ( ph -> ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) ) = ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) ( Hom ` D ) z ) , f e. ( ( Hom ` D ) ` u ) |-> ( g ( u .xb z ) f ) ) ) )
65		comfeq.4	. . . . . . 7 |- ( ph -> B = ( Base ` D ) )
66	65, 65	xpeq12d 5024	. . . . . 6 |- ( ph -> ( B X. B ) = ( ( Base ` D ) X. ( Base ` D ) ) )
67		eqidd 2468	. . . . . 6 |- ( ph -> ( g e. ( ( 2nd ` u ) ( Hom ` D ) z ) , f e. ( ( Hom ` D ) ` u ) |-> ( g ( u .xb z ) f ) ) = ( g e. ( ( 2nd ` u ) ( Hom ` D ) z ) , f e. ( ( Hom ` D ) ` u ) |-> ( g ( u .xb z ) f ) ) )
68	66, 65, 67	mpt2eq123dv 6342	. . . . 5 |- ( ph -> ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) ( Hom ` D ) z ) , f e. ( ( Hom ` D ) ` u ) |-> ( g ( u .xb z ) f ) ) ) = ( u e. ( ( Base ` D ) X. ( Base ` D ) ) , z e. ( Base ` D ) |-> ( g e. ( ( 2nd ` u ) ( Hom ` D ) z ) , f e. ( ( Hom ` D ) ` u ) |-> ( g ( u .xb z ) f ) ) ) )
69	64, 68	eqtrd 2508	. . . 4 |- ( ph -> ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) ) = ( u e. ( ( Base ` D ) X. ( Base ` D ) ) , z e. ( Base ` D ) |-> ( g e. ( ( 2nd ` u ) ( Hom ` D ) z ) , f e. ( ( Hom ` D ) ` u ) |-> ( g ( u .xb z ) f ) ) ) )
70		eqid 2467	. . . . 5 |- (compf ` D ) = (compf ` D )
71		eqid 2467	. . . . 5 |- ( Base ` D ) = ( Base ` D )
72		comfeq.2	. . . . 5 |- .xb = (comp ` D )
73	70, 71, 40, 72	comfffval 14953	. . . 4 |- (compf ` D ) = ( u e. ( ( Base ` D ) X. ( Base ` D ) ) , z e. ( Base ` D ) |-> ( g e. ( ( 2nd ` u ) ( Hom ` D ) z ) , f e. ( ( Hom ` D ) ` u ) |-> ( g ( u .xb z ) f ) ) )
74	69, 73	syl6eqr 2526	. . 3 |- ( ph -> ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) ) = (compf ` D ) )
75	39, 74	eqeq12d 2489	. 2 |- ( ph -> ( ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .x. z ) f ) ) ) = ( u e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` u ) H z ) , f e. ( H ` u ) |-> ( g ( u .xb z ) f ) ) ) <-> (compf ` C ) = (compf ` D ) ) )
76	29, 75	syl5rbbr 260	1 |- ( ph -> ( (compf ` C ) = (compf ` D ) <-> A. x e. B A. y e. B A. z e. B A. f e. ( x H y ) A. g e. ( y H z ) ( g ( <. x , y >. .x. z ) f ) = ( g ( <. x , y >. .xb z ) f ) ) )

Syntax hints:   -> wi 4   <-> wb 184   /\ w3a 973   = wceq 1379   e. wcel 1767   A.wral 2814   _Vcvv 3113   <.cop 4033   X. cxp 4997   ` cfv 5587  (class class class)co 6283   |-> cmpt2 6285   1stc1st 6782   2ndc2nd 6783   Basecbs 14489   Hom chom 14565  compcco 14566   Hom _f chomf 14920  comp_fccomf 14921

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1601  ax-4 1612  ax-5 1680  ax-6 1719  ax-7 1739  ax-8 1769  ax-9 1771  ax-10 1786  ax-11 1791  ax-12 1803  ax-13 1968  ax-ext 2445  ax-rep 4558  ax-sep 4568  ax-nul 4576  ax-pow 4625  ax-pr 4686  ax-un 6575

This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3an 975  df-tru 1382  df-ex 1597  df-nf 1600  df-sb 1712  df-eu 2279  df-mo 2280  df-clab 2453  df-cleq 2459  df-clel 2462  df-nfc 2617  df-ne 2664  df-ral 2819  df-rex 2820  df-reu 2821  df-rab 2823  df-v 3115  df-sbc 3332  df-csb 3436  df-dif 3479  df-un 3481  df-in 3483  df-ss 3490  df-nul 3786  df-if 3940  df-pw 4012  df-sn 4028  df-pr 4030  df-op 4034  df-uni 4246  df-iun 4327  df-br 4448  df-opab 4506  df-mpt 4507  df-id 4795  df-xp 5005  df-rel 5006  df-cnv 5007  df-co 5008  df-dm 5009  df-rn 5010  df-res 5011  df-ima 5012  df-iota 5550  df-fun 5589  df-fn 5590  df-f 5591  df-f1 5592  df-fo 5593  df-f1o 5594  df-fv 5595  df-ov 6286  df-oprab 6287  df-mpt2 6288  df-1st 6784  df-2nd 6785  df-homf 14924  df-comf 14925

This theorem is referenced by:  comfeqd  14962  2oppccomf  14980  oppccomfpropd  14982  resssetc  15276  resscatc  15289