Theorem cnco 14541

Description: The composition of two continuous functions is a continuous function. (Contributed by FL, 8-Dec-2006.) (Revised by Mario Carneiro, 21-Aug-2015.)

Assertion

Ref	Expression
cnco	|- ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) -> ( G o. F ) e. ( J Cn L ) )

Proof of Theorem cnco

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		cntop1 14521	. . 3 |- ( F e. ( J Cn K ) -> J e. Top )
2		cntop2 14522	. . 3 |- ( G e. ( K Cn L ) -> L e. Top )
3	1, 2	anim12i 338	. 2 |- ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) -> ( J e. Top /\ L e. Top ) )
4		eqid 2196	. . . . 5 |- U. K = U. K
5		eqid 2196	. . . . 5 |- U. L = U. L
6	4, 5	cnf 14524	. . . 4 |- ( G e. ( K Cn L ) -> G : U. K --> U. L )
7		eqid 2196	. . . . 5 |- U. J = U. J
8	7, 4	cnf 14524	. . . 4 |- ( F e. ( J Cn K ) -> F : U. J --> U. K )
9		fco 5426	. . . 4 |- ( ( G : U. K --> U. L /\ F : U. J --> U. K ) -> ( G o. F ) : U. J --> U. L )
10	6, 8, 9	syl2anr 290	. . 3 |- ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) -> ( G o. F ) : U. J --> U. L )
11		cnvco 4852	. . . . . . 7 |- `' ( G o. F ) = ( `' F o. `' G )
12	11	imaeq1i 5007	. . . . . 6 |- ( `' ( G o. F ) " x ) = ( ( `' F o. `' G ) " x )
13		imaco 5176	. . . . . 6 |- ( ( `' F o. `' G ) " x ) = ( `' F " ( `' G " x ) )
14	12, 13	eqtri 2217	. . . . 5 |- ( `' ( G o. F ) " x ) = ( `' F " ( `' G " x ) )
15		simpll 527	. . . . . 6 |- ( ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) /\ x e. L ) -> F e. ( J Cn K ) )
16		cnima 14540	. . . . . . 7 |- ( ( G e. ( K Cn L ) /\ x e. L ) -> ( `' G " x ) e. K )
17	16	adantll 476	. . . . . 6 |- ( ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) /\ x e. L ) -> ( `' G " x ) e. K )
18		cnima 14540	. . . . . 6 |- ( ( F e. ( J Cn K ) /\ ( `' G " x ) e. K ) -> ( `' F " ( `' G " x ) ) e. J )
19	15, 17, 18	syl2anc 411	. . . . 5 |- ( ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) /\ x e. L ) -> ( `' F " ( `' G " x ) ) e. J )
20	14, 19	eqeltrid 2283	. . . 4 |- ( ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) /\ x e. L ) -> ( `' ( G o. F ) " x ) e. J )
21	20	ralrimiva 2570	. . 3 |- ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) -> A. x e. L ( `' ( G o. F ) " x ) e. J )
22	10, 21	jca 306	. 2 |- ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) -> ( ( G o. F ) : U. J --> U. L /\ A. x e. L ( `' ( G o. F ) " x ) e. J ) )
23	7, 5	iscn2 14520	. 2 |- ( ( G o. F ) e. ( J Cn L ) <-> ( ( J e. Top /\ L e. Top ) /\ ( ( G o. F ) : U. J --> U. L /\ A. x e. L ( `' ( G o. F ) " x ) e. J ) ) )
24	3, 22, 23	sylanbrc 417	1 |- ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) -> ( G o. F ) e. ( J Cn L ) )

Syntax hints:   -> wi 4   /\ wa 104   e. wcel 2167   A.wral 2475   U.cuni 3840   `'ccnv 4663   "cima 4667   o. ccom 4668   -->wf 5255  (class class class)co 5925   Topctop 14317   Cn ccn 14505

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 615  ax-in2 616  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243  ax-un 4469  ax-setind 4574

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ne 2368  df-ral 2480  df-rex 2481  df-rab 2484  df-v 2765  df-sbc 2990  df-csb 3085  df-dif 3159  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-uni 3841  df-iun 3919  df-br 4035  df-opab 4096  df-mpt 4097  df-id 4329  df-xp 4670  df-rel 4671  df-cnv 4672  df-co 4673  df-dm 4674  df-rn 4675  df-res 4676  df-ima 4677  df-iota 5220  df-fun 5261  df-fn 5262  df-f 5263  df-fv 5267  df-ov 5928  df-oprab 5929  df-mpo 5930  df-1st 6207  df-2nd 6208  df-map 6718  df-top 14318  df-topon 14331  df-cn 14508

This theorem is referenced by:  txcn  14595  cnmpt11  14603  cnmpt21  14611  hmeoco  14636