Theorem txtopon 15005

Description: The underlying set of the product of two topologies. (Contributed by Mario Carneiro, 22-Aug-2015.) (Revised by Mario Carneiro, 2-Sep-2015.)

Assertion

Ref	Expression
txtopon	|- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ( R tX S ) e. (TopOn ` ( X X. Y ) ) )

Proof of Theorem txtopon

Dummy variables v u are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		topontop 14757	. . 3 |- ( R e. (TopOn ` X ) -> R e. Top )
2		topontop 14757	. . 3 |- ( S e. (TopOn ` Y ) -> S e. Top )
3		txtop 15003	. . 3 |- ( ( R e. Top /\ S e. Top ) -> ( R tX S ) e. Top )
4	1, 2, 3	syl2an 289	. 2 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ( R tX S ) e. Top )
5		eqid 2231	. . . . 5 |- ran ( u e. R , v e. S |-> ( u X. v ) ) = ran ( u e. R , v e. S |-> ( u X. v ) )
6		eqid 2231	. . . . 5 |- U. R = U. R
7		eqid 2231	. . . . 5 |- U. S = U. S
8	5, 6, 7	txuni2 14999	. . . 4 |- ( U. R X. U. S ) = U. ran ( u e. R , v e. S |-> ( u X. v ) )
9		toponuni 14758	. . . . 5 |- ( R e. (TopOn ` X ) -> X = U. R )
10		toponuni 14758	. . . . 5 |- ( S e. (TopOn ` Y ) -> Y = U. S )
11		xpeq12 4744	. . . . 5 |- ( ( X = U. R /\ Y = U. S ) -> ( X X. Y ) = ( U. R X. U. S ) )
12	9, 10, 11	syl2an 289	. . . 4 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ( X X. Y ) = ( U. R X. U. S ) )
13	5	txbasex 15000	. . . . 5 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ran ( u e. R , v e. S |-> ( u X. v ) ) e. _V )
14		unitg 14805	. . . . 5 |- ( ran ( u e. R , v e. S |-> ( u X. v ) ) e. _V -> U. ( topGen ` ran ( u e. R , v e. S |-> ( u X. v ) ) ) = U. ran ( u e. R , v e. S |-> ( u X. v ) ) )
15	13, 14	syl 14	. . . 4 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> U. ( topGen ` ran ( u e. R , v e. S |-> ( u X. v ) ) ) = U. ran ( u e. R , v e. S |-> ( u X. v ) ) )
16	8, 12, 15	3eqtr4a 2290	. . 3 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ( X X. Y ) = U. ( topGen ` ran ( u e. R , v e. S |-> ( u X. v ) ) ) )
17	5	txval 14998	. . . 4 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ( R tX S ) = ( topGen ` ran ( u e. R , v e. S |-> ( u X. v ) ) ) )
18	17	unieqd 3904	. . 3 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> U. ( R tX S ) = U. ( topGen ` ran ( u e. R , v e. S |-> ( u X. v ) ) ) )
19	16, 18	eqtr4d 2267	. 2 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ( X X. Y ) = U. ( R tX S ) )
20		istopon 14756	. 2 |- ( ( R tX S ) e. (TopOn ` ( X X. Y ) ) <-> ( ( R tX S ) e. Top /\ ( X X. Y ) = U. ( R tX S ) ) )
21	4, 19, 20	sylanbrc 417	1 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ( R tX S ) e. (TopOn ` ( X X. Y ) ) )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1397   e. wcel 2202   _Vcvv 2802   U.cuni 3893   X. cxp 4723   ran crn 4726   ` cfv 5326  (class class class)co 6018   e. cmpo 6020   topGenctg 13355   Topctop 14740  TopOnctopon 14753   tX ctx 14995

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-coll 4204  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-reu 2517  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-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-ov 6021  df-oprab 6022  df-mpo 6023  df-1st 6303  df-2nd 6304  df-topgen 13361  df-top 14741  df-topon 14754  df-bases 14786  df-tx 14996

This theorem is referenced by:  txuni  15006  tx1cn  15012  tx2cn  15013  txcnp  15014  txcnmpt  15016  txdis1cn  15021  txlm  15022  lmcn2  15023  cnmpt12  15030  cnmpt2c  15033  cnmpt21  15034  cnmpt2t  15036  cnmpt22  15037  cnmpt22f  15038  cnmpt2res  15040  cnmptcom  15041  txmetcn  15262  limccnp2lem  15419  limccnp2cntop  15420  dvcnp2cntop  15442  dvaddxxbr  15444  dvmulxxbr  15445  dvcoapbr  15450