Theorem cnco 14944

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 14924	. . 3 |- ( F e. ( J Cn K ) -> J e. Top )
2		cntop2 14925	. . 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 2231	. . . . 5 |- U. K = U. K
5		eqid 2231	. . . . 5 |- U. L = U. L
6	4, 5	cnf 14927	. . . 4 |- ( G e. ( K Cn L ) -> G : U. K --> U. L )
7		eqid 2231	. . . . 5 |- U. J = U. J
8	7, 4	cnf 14927	. . . 4 |- ( F e. ( J Cn K ) -> F : U. J --> U. K )
9		fco 5500	. . . 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 4915	. . . . . . 7 |- `' ( G o. F ) = ( `' F o. `' G )
12	11	imaeq1i 5073	. . . . . 6 |- ( `' ( G o. F ) " x ) = ( ( `' F o. `' G ) " x )
13		imaco 5242	. . . . . 6 |- ( ( `' F o. `' G ) " x ) = ( `' F " ( `' G " x ) )
14	12, 13	eqtri 2252	. . . . 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 14943	. . . . . . 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 14943	. . . . . 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 2318	. . . 4 |- ( ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) /\ x e. L ) -> ( `' ( G o. F ) " x ) e. J )
21	20	ralrimiva 2605	. . 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 14923	. 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 2202   A.wral 2510   U.cuni 3893   `'ccnv 4724   "cima 4728   o. ccom 4729   -->wf 5322  (class class class)co 6017   Topctop 14720   Cn ccn 14908

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 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-1st 6302  df-2nd 6303  df-map 6818  df-top 14721  df-topon 14734  df-cn 14911

This theorem is referenced by:  txcn  14998  cnmpt11  15006  cnmpt21  15014  hmeoco  15039