Theorem txtopon 15127

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 14879	. . 3 |- ( R e. (TopOn ` X ) -> R e. Top )
2		topontop 14879	. . 3 |- ( S e. (TopOn ` Y ) -> S e. Top )
3		txtop 15125	. . 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 2232	. . . . 5 |- ran ( u e. R , v e. S |-> ( u X. v ) ) = ran ( u e. R , v e. S |-> ( u X. v ) )
6		eqid 2232	. . . . 5 |- U. R = U. R
7		eqid 2232	. . . . 5 |- U. S = U. S
8	5, 6, 7	txuni2 15121	. . . 4 |- ( U. R X. U. S ) = U. ran ( u e. R , v e. S |-> ( u X. v ) )
9		toponuni 14880	. . . . 5 |- ( R e. (TopOn ` X ) -> X = U. R )
10		toponuni 14880	. . . . 5 |- ( S e. (TopOn ` Y ) -> Y = U. S )
11		xpeq12 4768	. . . . 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 15122	. . . . 5 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ran ( u e. R , v e. S |-> ( u X. v ) ) e. _V )
14		unitg 14927	. . . . 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 2291	. . 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 15120	. . . 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 3925	. . 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 2268	. 2 |- ( ( R e. (TopOn ` X ) /\ S e. (TopOn ` Y ) ) -> ( X X. Y ) = U. ( R tX S ) )
20		istopon 14878	. 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 1398   e. wcel 2203   _Vcvv 2813   U.cuni 3914   X. cxp 4747   ran crn 4750   ` cfv 5352  (class class class)co 6050   e. cmpo 6052   topGenctg 13467   Topctop 14862  TopOnctopon 14875   tX ctx 15117

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-coll 4225  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-ov 6053  df-oprab 6054  df-mpo 6055  df-1st 6334  df-2nd 6335  df-topgen 13473  df-top 14863  df-topon 14876  df-bases 14908  df-tx 15118

This theorem is referenced by:  txuni  15128  tx1cn  15134  tx2cn  15135  txcnp  15136  txcnmpt  15138  txdis1cn  15143  txlm  15144  lmcn2  15145  cnmpt12  15152  cnmpt2c  15155  cnmpt21  15156  cnmpt2t  15158  cnmpt22  15159  cnmpt22f  15160  cnmpt2res  15162  cnmptcom  15163  txmetcn  15384  limccnp2lem  15541  limccnp2cntop  15542  dvcnp2cntop  15564  dvaddxxbr  15566  dvmulxxbr  15567  dvcoapbr  15572