Theorem cnco 14808

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 14788	. . 3 |- ( F e. ( J Cn K ) -> J e. Top )
2		cntop2 14789	. . 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 2207	. . . . 5 |- U. K = U. K
5		eqid 2207	. . . . 5 |- U. L = U. L
6	4, 5	cnf 14791	. . . 4 |- ( G e. ( K Cn L ) -> G : U. K --> U. L )
7		eqid 2207	. . . . 5 |- U. J = U. J
8	7, 4	cnf 14791	. . . 4 |- ( F e. ( J Cn K ) -> F : U. J --> U. K )
9		fco 5461	. . . 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 4881	. . . . . . 7 |- `' ( G o. F ) = ( `' F o. `' G )
12	11	imaeq1i 5038	. . . . . 6 |- ( `' ( G o. F ) " x ) = ( ( `' F o. `' G ) " x )
13		imaco 5207	. . . . . 6 |- ( ( `' F o. `' G ) " x ) = ( `' F " ( `' G " x ) )
14	12, 13	eqtri 2228	. . . . 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 14807	. . . . . . 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 14807	. . . . . 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 2294	. . . 4 |- ( ( ( F e. ( J Cn K ) /\ G e. ( K Cn L ) ) /\ x e. L ) -> ( `' ( G o. F ) " x ) e. J )
21	20	ralrimiva 2581	. . 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 14787	. 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 2178   A.wral 2486   U.cuni 3864   `'ccnv 4692   "cima 4696   o. ccom 4697   -->wf 5286  (class class class)co 5967   Topctop 14584   Cn ccn 14772

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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2180  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269  ax-un 4498  ax-setind 4603

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-ral 2491  df-rex 2492  df-rab 2495  df-v 2778  df-sbc 3006  df-csb 3102  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-uni 3865  df-iun 3943  df-br 4060  df-opab 4122  df-mpt 4123  df-id 4358  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706  df-iota 5251  df-fun 5292  df-fn 5293  df-f 5294  df-fv 5298  df-ov 5970  df-oprab 5971  df-mpo 5972  df-1st 6249  df-2nd 6250  df-map 6760  df-top 14585  df-topon 14598  df-cn 14775

This theorem is referenced by:  txcn  14862  cnmpt11  14870  cnmpt21  14878  hmeoco  14903