Theorem ssntr 20862

Description: An open subset of a set is a subset of the set's interior. (Contributed by Jeff Hankins, 31-Aug-2009.) (Revised by Mario Carneiro, 11-Nov-2013.)

Hypothesis

Ref	Expression
clscld.1	|- X = U. J

Assertion

Ref	Expression
ssntr	|- ( ( ( J e. Top /\ S C_ X ) /\ ( O e. J /\ O C_ S ) ) -> O C_ ( ( int ` J ) ` S ) )

Proof of Theorem ssntr

Step	Hyp	Ref	Expression
1		elin 3796	. . . . 5 |- ( O e. ( J i^i ~P S ) <-> ( O e. J /\ O e. ~P S ) )
2		elpwg 4166	. . . . . 6 |- ( O e. J -> ( O e. ~P S <-> O C_ S ) )
3	2	pm5.32i 669	. . . . 5 |- ( ( O e. J /\ O e. ~P S ) <-> ( O e. J /\ O C_ S ) )
4	1, 3	bitr2i 265	. . . 4 |- ( ( O e. J /\ O C_ S ) <-> O e. ( J i^i ~P S ) )
5		elssuni 4467	. . . 4 |- ( O e. ( J i^i ~P S ) -> O C_ U. ( J i^i ~P S ) )
6	4, 5	sylbi 207	. . 3 |- ( ( O e. J /\ O C_ S ) -> O C_ U. ( J i^i ~P S ) )
7	6	adantl 482	. 2 |- ( ( ( J e. Top /\ S C_ X ) /\ ( O e. J /\ O C_ S ) ) -> O C_ U. ( J i^i ~P S ) )
8		clscld.1	. . . 4 |- X = U. J
9	8	ntrval 20840	. . 3 |- ( ( J e. Top /\ S C_ X ) -> ( ( int ` J ) ` S ) = U. ( J i^i ~P S ) )
10	9	adantr 481	. 2 |- ( ( ( J e. Top /\ S C_ X ) /\ ( O e. J /\ O C_ S ) ) -> ( ( int ` J ) ` S ) = U. ( J i^i ~P S ) )
11	7, 10	sseqtr4d 3642	1 |- ( ( ( J e. Top /\ S C_ X ) /\ ( O e. J /\ O C_ S ) ) -> O C_ ( ( int ` J ) ` S ) )

Syntax hints:   -> wi 4   /\ wa 384   = wceq 1483   e. wcel 1990   i^i cin 3573   C_ wss 3574   ~Pcpw 4158   U.cuni 4436   ` cfv 5888   Topctop 20698   intcnt 20821

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-top 20699  df-ntr 20824

This theorem is referenced by:  ntrin  20865  neiint  20908  restntr  20986  cnntri  21075  xkococnlem  21462  iccntr  22624  bcthlem5  23125  ftc1  23805  lgamucov  24764  cvmlift2lem12  31296  cvmlift3lem7  31307  opnregcld  32325  ftc1cnnc  33484