Theorem ssntr 21666

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 4169	. . . . 5 ⊢ (𝑂 ∈ (𝐽 ∩ 𝒫 𝑆) ↔ (𝑂 ∈ 𝐽 ∧ 𝑂 ∈ 𝒫 𝑆))
2		elpwg 4542	. . . . . 6 ⊢ (𝑂 ∈ 𝐽 → (𝑂 ∈ 𝒫 𝑆 ↔ 𝑂 ⊆ 𝑆))
3	2	pm5.32i 577	. . . . 5 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ∈ 𝒫 𝑆) ↔ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆))
4	1, 3	bitr2i 278	. . . 4 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆) ↔ 𝑂 ∈ (𝐽 ∩ 𝒫 𝑆))
5		elssuni 4868	. . . 4 ⊢ (𝑂 ∈ (𝐽 ∩ 𝒫 𝑆) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆))
6	4, 5	sylbi 219	. . 3 ⊢ ((𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆))
7	6	adantl 484	. 2 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → 𝑂 ⊆ ∪ (𝐽 ∩ 𝒫 𝑆))
8		clscld.1	. . . 4 ⊢ 𝑋 = ∪ 𝐽
9	8	ntrval 21644	. . 3 ⊢ ((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) → ((int‘𝐽)‘𝑆) = ∪ (𝐽 ∩ 𝒫 𝑆))
10	9	adantr 483	. 2 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → ((int‘𝐽)‘𝑆) = ∪ (𝐽 ∩ 𝒫 𝑆))
11	7, 10	sseqtrrd 4008	1 ⊢ (((𝐽 ∈ Top ∧ 𝑆 ⊆ 𝑋) ∧ (𝑂 ∈ 𝐽 ∧ 𝑂 ⊆ 𝑆)) → 𝑂 ⊆ ((int‘𝐽)‘𝑆))

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537   ∈ wcel 2114   ∩ cin 3935   ⊆ wss 3936  𝒫 cpw 4539  ∪ cuni 4838  ‘cfv 6355  Topctop 21501  intcnt 21625

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-rep 5190  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-id 5460  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-top 21502  df-ntr 21628

This theorem is referenced by:  ntrin  21669  neiint  21712  restntr  21790  cnntri  21879  xkococnlem  22267  iccntr  23429  bcthlem5  23931  ftc1  24639  lgamucov  25615  cvmlift2lem12  32561  cvmlift3lem7  32572  opnregcld  33678  ftc1cnnc  34981