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Theorem ntrfval 22391
Description: The interior function on the subsets of a topology's base set. (Contributed by NM, 10-Sep-2006.) (Revised by Mario Carneiro, 11-Nov-2013.)
Hypothesis
Ref Expression
cldval.1 𝑋 = βˆͺ 𝐽
Assertion
Ref Expression
ntrfval (𝐽 ∈ Top β†’ (intβ€˜π½) = (π‘₯ ∈ 𝒫 𝑋 ↦ βˆͺ (𝐽 ∩ 𝒫 π‘₯)))
Distinct variable groups:   π‘₯,𝐽   π‘₯,𝑋

Proof of Theorem ntrfval
Dummy variable 𝑗 is distinct from all other variables.
StepHypRef Expression
1 cldval.1 . . . 4 𝑋 = βˆͺ 𝐽
21topopn 22271 . . 3 (𝐽 ∈ Top β†’ 𝑋 ∈ 𝐽)
3 pwexg 5334 . . 3 (𝑋 ∈ 𝐽 β†’ 𝒫 𝑋 ∈ V)
4 mptexg 7172 . . 3 (𝒫 𝑋 ∈ V β†’ (π‘₯ ∈ 𝒫 𝑋 ↦ βˆͺ (𝐽 ∩ 𝒫 π‘₯)) ∈ V)
52, 3, 43syl 18 . 2 (𝐽 ∈ Top β†’ (π‘₯ ∈ 𝒫 𝑋 ↦ βˆͺ (𝐽 ∩ 𝒫 π‘₯)) ∈ V)
6 unieq 4877 . . . . . 6 (𝑗 = 𝐽 β†’ βˆͺ 𝑗 = βˆͺ 𝐽)
76, 1eqtr4di 2791 . . . . 5 (𝑗 = 𝐽 β†’ βˆͺ 𝑗 = 𝑋)
87pweqd 4578 . . . 4 (𝑗 = 𝐽 β†’ 𝒫 βˆͺ 𝑗 = 𝒫 𝑋)
9 ineq1 4166 . . . . 5 (𝑗 = 𝐽 β†’ (𝑗 ∩ 𝒫 π‘₯) = (𝐽 ∩ 𝒫 π‘₯))
109unieqd 4880 . . . 4 (𝑗 = 𝐽 β†’ βˆͺ (𝑗 ∩ 𝒫 π‘₯) = βˆͺ (𝐽 ∩ 𝒫 π‘₯))
118, 10mpteq12dv 5197 . . 3 (𝑗 = 𝐽 β†’ (π‘₯ ∈ 𝒫 βˆͺ 𝑗 ↦ βˆͺ (𝑗 ∩ 𝒫 π‘₯)) = (π‘₯ ∈ 𝒫 𝑋 ↦ βˆͺ (𝐽 ∩ 𝒫 π‘₯)))
12 df-ntr 22387 . . 3 int = (𝑗 ∈ Top ↦ (π‘₯ ∈ 𝒫 βˆͺ 𝑗 ↦ βˆͺ (𝑗 ∩ 𝒫 π‘₯)))
1311, 12fvmptg 6947 . 2 ((𝐽 ∈ Top ∧ (π‘₯ ∈ 𝒫 𝑋 ↦ βˆͺ (𝐽 ∩ 𝒫 π‘₯)) ∈ V) β†’ (intβ€˜π½) = (π‘₯ ∈ 𝒫 𝑋 ↦ βˆͺ (𝐽 ∩ 𝒫 π‘₯)))
145, 13mpdan 686 1 (𝐽 ∈ Top β†’ (intβ€˜π½) = (π‘₯ ∈ 𝒫 𝑋 ↦ βˆͺ (𝐽 ∩ 𝒫 π‘₯)))
Colors of variables: wff setvar class
Syntax hints:   β†’ wi 4   = wceq 1542   ∈ wcel 2107  Vcvv 3444   ∩ cin 3910  π’« cpw 4561  βˆͺ cuni 4866   ↦ cmpt 5189  β€˜cfv 6497  Topctop 22258  intcnt 22384
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 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704  ax-rep 5243  ax-sep 5257  ax-nul 5264  ax-pow 5321  ax-pr 5385
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-mo 2535  df-eu 2564  df-clab 2711  df-cleq 2725  df-clel 2811  df-nfc 2886  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3353  df-rab 3407  df-v 3446  df-sbc 3741  df-csb 3857  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4284  df-if 4488  df-pw 4563  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4867  df-iun 4957  df-br 5107  df-opab 5169  df-mpt 5190  df-id 5532  df-xp 5640  df-rel 5641  df-cnv 5642  df-co 5643  df-dm 5644  df-rn 5645  df-res 5646  df-ima 5647  df-iota 6449  df-fun 6499  df-fn 6500  df-f 6501  df-f1 6502  df-fo 6503  df-f1o 6504  df-fv 6505  df-top 22259  df-ntr 22387
This theorem is referenced by:  ntrval  22403  ntrrn  42482  ntrf  42483  dssmapntrcls  42488
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