Theorem catccofval 16750

Description: Composition in the category of categories. (Contributed by Mario Carneiro, 3-Jan-2017.)

Hypotheses

Ref	Expression
catcbas.c	|- C = (CatCat ` U )
catcbas.b	|- B = ( Base ` C )
catcbas.u	|- ( ph -> U e. V )
catcco.o	|- .x. = (comp ` C )

Assertion

Ref	Expression
catccofval	|- ( ph -> .x. = ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) )

Distinct variable groups:   z, v, B   f, g, v, z, ph   v, U, z

Allowed substitution hints:   B( f, g)   C( z, v, f, g)   .x. ( z, v, f, g)   U( f, g)   V( z, v, f, g)

Proof of Theorem catccofval

Dummy variables x y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		catcbas.c	. . . 4 |- C = (CatCat ` U )
2		catcbas.u	. . . 4 |- ( ph -> U e. V )
3		catcbas.b	. . . . 5 |- B = ( Base ` C )
4	1, 3, 2	catcbas 16747	. . . 4 |- ( ph -> B = ( U i^i Cat ) )
5		eqid 2622	. . . . 5 |- ( Hom ` C ) = ( Hom ` C )
6	1, 3, 2, 5	catchomfval 16748	. . . 4 |- ( ph -> ( Hom ` C ) = ( x e. B , y e. B |-> ( x Func y ) ) )
7		eqidd 2623	. . . 4 |- ( ph -> ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) = ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) )
8	1, 2, 4, 6, 7	catcval 16746	. . 3 |- ( ph -> C = { <. ( Base ` ndx ) , B >. , <. ( Hom ` ndx ) , ( Hom ` C ) >. , <. (comp ` ndx ) , ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) >. } )
9	8	fveq2d 6195	. 2 |- ( ph -> (comp ` C ) = (comp ` { <. ( Base ` ndx ) , B >. , <. ( Hom ` ndx ) , ( Hom ` C ) >. , <. (comp ` ndx ) , ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) >. } ) )
10		catcco.o	. 2 |- .x. = (comp ` C )
11		fvex 6201	. . . . . 6 |- ( Base ` C ) e. _V
12	3, 11	eqeltri 2697	. . . . 5 |- B e. _V
13	12, 12	xpex 6962	. . . 4 |- ( B X. B ) e. _V
14	13, 12	mpt2ex 7247	. . 3 |- ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) e. _V
15		catstr 16617	. . . 4 |- { <. ( Base ` ndx ) , B >. , <. ( Hom ` ndx ) , ( Hom ` C ) >. , <. (comp ` ndx ) , ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) >. } Struct <. 1 , ; 1 5 >.
16		ccoid 16077	. . . 4 |- comp = Slot (comp ` ndx )
17		snsstp3 4349	. . . 4 |- { <. (comp ` ndx ) , ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) >. } C_ { <. ( Base ` ndx ) , B >. , <. ( Hom ` ndx ) , ( Hom ` C ) >. , <. (comp ` ndx ) , ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) >. }
18	15, 16, 17	strfv 15907	. . 3 |- ( ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) e. _V -> ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) = (comp ` { <. ( Base ` ndx ) , B >. , <. ( Hom ` ndx ) , ( Hom ` C ) >. , <. (comp ` ndx ) , ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) >. } ) )
19	14, 18	ax-mp 5	. 2 |- ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) = (comp ` { <. ( Base ` ndx ) , B >. , <. ( Hom ` ndx ) , ( Hom ` C ) >. , <. (comp ` ndx ) , ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) >. } )
20	9, 10, 19	3eqtr4g 2681	1 |- ( ph -> .x. = ( v e. ( B X. B ) , z e. B |-> ( g e. ( ( 2nd ` v ) Func z ) , f e. ( Func ` v ) |-> ( g o.func f ) ) ) )

Syntax hints:   -> wi 4   = wceq 1483   e. wcel 1990   _Vcvv 3200   {ctp 4181   <.cop 4183   X. cxp 5112   ` cfv 5888  (class class class)co 6650   |-> cmpt2 6652   2ndc2nd 7167   1c1 9937   5c5 11073  ;cdc 11493   ndxcnx 15854   Basecbs 15857   Hom chom 15952  compcco 15953   Func cfunc 16514   o._func ccofu 16516  CatCatccatc 16744

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-nn 11021  df-2 11079  df-3 11080  df-4 11081  df-5 11082  df-6 11083  df-7 11084  df-8 11085  df-9 11086  df-n0 11293  df-z 11378  df-dec 11494  df-uz 11688  df-fz 12327  df-struct 15859  df-ndx 15860  df-slot 15861  df-base 15863  df-hom 15966  df-cco 15967  df-catc 16745

This theorem is referenced by:  catcco  16751