Theorem ssntr 22209

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 = ∪ 𝐽

Assertion

Ref	Expression
ssntr	⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → 𝑂 ⊆ ((int‘𝐽)‘𝑆))

Proof of Theorem ssntr

Step	Hyp	Ref	Expression
1		elin 3903	. . . . 5 ⊢ (𝑂 ∈ (𝐽 ∩ 𝒫 𝑆) ↔ (𝑂 ∈ 𝐽 ∧ 𝑂 ∈ 𝒫 𝑆))
2		elpwg 4536	. . . . . 6 ⊢ (𝑂 ∈ 𝐽 → (𝑂 ∈ 𝒫 𝑆 ↔ 𝑂 ⊆ 𝑆))
3	2	pm5.32i 575	. . . . 5 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ∈ 𝒫 𝑆) ↔ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆))
4	1, 3	bitr2i 275	. . . 4 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆) ↔ 𝑂 ∈ (𝐽 ∩ 𝒫 𝑆))
5		elssuni 4871	. . . 4 ⊢ (𝑂 ∈ (𝐽 ∩ 𝒫 𝑆) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆))
6	4, 5	sylbi 216	. . 3 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆))
7	6	adantl 482	. 2 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆))
8		clscld.1	. . . 4 ⊢ 𝑋 = ∪ 𝐽
9	8	ntrval 22187	. . 3 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((int‘𝐽)‘𝑆) = ∪ (𝐽 ∩ 𝒫 𝑆))
10	9	adantr 481	. 2 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → ((int‘𝐽)‘𝑆) = ∪ (𝐽 ∩ 𝒫 𝑆))
11	7, 10	sseqtrrd 3962	1 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → 𝑂 ⊆ ((int‘𝐽)‘𝑆))

Syntax hints:   → wi 4   ∧ wa 396   = wceq 1539   ∈ wcel 2106   ∩ cin 3886   ⊆ wss 3887  𝒫 cpw 4533  ∪ cuni 4839  ‘cfv 6433  Topctop 22042  intcnt 22168

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2709  ax-rep 5209  ax-sep 5223  ax-nul 5230  ax-pow 5288  ax-pr 5352  ax-un 7588

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1783  df-nf 1787  df-sb 2068  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2816  df-nfc 2889  df-ne 2944  df-ral 3069  df-rex 3070  df-reu 3072  df-rab 3073  df-v 3434  df-sbc 3717  df-csb 3833  df-dif 3890  df-un 3892  df-in 3894  df-ss 3904  df-nul 4257  df-if 4460  df-pw 4535  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4840  df-iun 4926  df-br 5075  df-opab 5137  df-mpt 5158  df-id 5489  df-xp 5595  df-rel 5596  df-cnv 5597  df-co 5598  df-dm 5599  df-rn 5600  df-res 5601  df-ima 5602  df-iota 6391  df-fun 6435  df-fn 6436  df-f 6437  df-f1 6438  df-fo 6439  df-f1o 6440  df-fv 6441  df-top 22043  df-ntr 22171

This theorem is referenced by:  ntrin  22212  neiint  22255  restntr  22333  cnntri  22422  xkococnlem  22810  iccntr  23984  bcthlem5  24492  ftc1  25206  lgamucov  26187  cvmlift2lem12  33276  cvmlift3lem7  33287  opnregcld  34519  ftc1cnnc  35849