Theorem ntrcls0 13984

Description: A subset whose closure has an empty interior also has an empty interior. (Contributed by NM, 4-Oct-2007.)

Hypothesis

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

Assertion

Ref	Expression
ntrcls0	|- ( ( J e. Top /\ S C_ X /\ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) = (/) ) -> ( ( int ` J ) ` S ) = (/) )

Proof of Theorem ntrcls0

Step	Hyp	Ref	Expression
1		simpl 109	. . . . 5 |- ( ( J e. Top /\ S C_ X ) -> J e. Top )
2		clscld.1	. . . . . 6 |- X = U. J
3	2	clsss3 13983	. . . . 5 |- ( ( J e. Top /\ S C_ X ) -> ( ( cls ` J ) ` S ) C_ X )
4	2	sscls 13973	. . . . 5 |- ( ( J e. Top /\ S C_ X ) -> S C_ ( ( cls ` J ) ` S ) )
5	2	ntrss 13972	. . . . 5 |- ( ( J e. Top /\ ( ( cls ` J ) ` S ) C_ X /\ S C_ ( ( cls ` J ) ` S ) ) -> ( ( int ` J ) ` S ) C_ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) )
6	1, 3, 4, 5	syl3anc 1248	. . . 4 |- ( ( J e. Top /\ S C_ X ) -> ( ( int ` J ) ` S ) C_ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) )
7	6	3adant3 1018	. . 3 |- ( ( J e. Top /\ S C_ X /\ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) = (/) ) -> ( ( int ` J ) ` S ) C_ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) )
8		sseq2 3191	. . . 4 |- ( ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) = (/) -> ( ( ( int ` J ) ` S ) C_ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) <-> ( ( int ` J ) ` S ) C_ (/) ) )
9	8	3ad2ant3 1021	. . 3 |- ( ( J e. Top /\ S C_ X /\ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) = (/) ) -> ( ( ( int ` J ) ` S ) C_ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) <-> ( ( int ` J ) ` S ) C_ (/) ) )
10	7, 9	mpbid 147	. 2 |- ( ( J e. Top /\ S C_ X /\ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) = (/) ) -> ( ( int ` J ) ` S ) C_ (/) )
11		ss0 3475	. 2 |- ( ( ( int ` J ) ` S ) C_ (/) -> ( ( int ` J ) ` S ) = (/) )
12	10, 11	syl 14	1 |- ( ( J e. Top /\ S C_ X /\ ( ( int ` J ) ` ( ( cls ` J ) ` S ) ) = (/) ) -> ( ( int ` J ) ` S ) = (/) )

Syntax hints:   -> wi 4   /\ wa 104   <-> wb 105   /\ w3a 979   = wceq 1363   e. wcel 2158   C_ wss 3141   (/)c0 3434   U.cuni 3821   ` cfv 5228   Topctop 13850   intcnt 13946   clsccl 13947

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 710  ax-5 1457  ax-7 1458  ax-gen 1459  ax-ie1 1503  ax-ie2 1504  ax-8 1514  ax-10 1515  ax-11 1516  ax-i12 1517  ax-bndl 1519  ax-4 1520  ax-17 1536  ax-i9 1540  ax-ial 1544  ax-i5r 1545  ax-13 2160  ax-14 2161  ax-ext 2169  ax-coll 4130  ax-sep 4133  ax-pow 4186  ax-pr 4221  ax-un 4445

This theorem depends on definitions:  df-bi 117  df-3an 981  df-tru 1366  df-fal 1369  df-nf 1471  df-sb 1773  df-eu 2039  df-mo 2040  df-clab 2174  df-cleq 2180  df-clel 2183  df-nfc 2318  df-ral 2470  df-rex 2471  df-reu 2472  df-rab 2474  df-v 2751  df-sbc 2975  df-csb 3070  df-dif 3143  df-un 3145  df-in 3147  df-ss 3154  df-nul 3435  df-pw 3589  df-sn 3610  df-pr 3611  df-op 3613  df-uni 3822  df-int 3857  df-iun 3900  df-br 4016  df-opab 4077  df-mpt 4078  df-id 4305  df-xp 4644  df-rel 4645  df-cnv 4646  df-co 4647  df-dm 4648  df-rn 4649  df-res 4650  df-ima 4651  df-iota 5190  df-fun 5230  df-fn 5231  df-f 5232  df-f1 5233  df-fo 5234  df-f1o 5235  df-fv 5236  df-top 13851  df-cld 13948  df-ntr 13949  df-cls 13950

This theorem is referenced by: (None)