Theorem ntrneicls11 40433

Description: If (pseudo-)interior and (pseudo-)neighborhood functions are related by the operator, 𝐹, then conditions equal to claiming that the interior of the empty set is the empty set hold equally. (Contributed by RP, 2-Jun-2021.)

Hypotheses

Ref	Expression
ntrnei.o	⊢ 𝑂 = (𝑖 ∈ V, 𝑗 ∈ V ↦ (𝑘 ∈ (𝒫 𝑗 ↑m 𝑖) ↦ (𝑙 ∈ 𝑗 ↦ {𝑚 ∈ 𝑖 ∣ 𝑙 ∈ (𝑘‘𝑚)})))
ntrnei.f	⊢ 𝐹 = (𝒫 𝐵𝑂𝐵)
ntrnei.r	⊢ (𝜑 → 𝐼𝐹𝑁)

Assertion

Ref	Expression
ntrneicls11	⊢ (𝜑 → ((𝐼‘∅) = ∅ ↔ ∀𝑥 ∈ 𝐵 ¬ ∅ ∈ (𝑁‘𝑥)))

Distinct variable groups:   𝐵,𝑖,𝑗,𝑘,𝑙,𝑚,𝑥   𝑘,𝐼,𝑙,𝑚,𝑥   𝜑,𝑖,𝑗,𝑘,𝑙,𝑥

Allowed substitution hints:   𝜑(𝑚)   𝐹(𝑥,𝑖,𝑗,𝑘,𝑚,𝑙)   𝐼(𝑖,𝑗)   𝑁(𝑥,𝑖,𝑗,𝑘,𝑚,𝑙)   𝑂(𝑥,𝑖,𝑗,𝑘,𝑚,𝑙)

Proof of Theorem ntrneicls11

Step	Hyp	Ref	Expression
1		ntrnei.o	. . . . . . . . 9 ⊢ 𝑂 = (𝑖 ∈ V, 𝑗 ∈ V ↦ (𝑘 ∈ (𝒫 𝑗 ↑m 𝑖) ↦ (𝑙 ∈ 𝑗 ↦ {𝑚 ∈ 𝑖 ∣ 𝑙 ∈ (𝑘‘𝑚)})))
2		ntrnei.f	. . . . . . . . 9 ⊢ 𝐹 = (𝒫 𝐵𝑂𝐵)
3		ntrnei.r	. . . . . . . . 9 ⊢ (𝜑 → 𝐼𝐹𝑁)
4	1, 2, 3	ntrneiiex 40419	. . . . . . . 8 ⊢ (𝜑 → 𝐼 ∈ (𝒫 𝐵 ↑m 𝒫 𝐵))
5		elmapi 8422	. . . . . . . 8 ⊢ (𝐼 ∈ (𝒫 𝐵 ↑m 𝒫 𝐵) → 𝐼:𝒫 𝐵⟶𝒫 𝐵)
6	4, 5	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝐼:𝒫 𝐵⟶𝒫 𝐵)
7		0elpw 5248	. . . . . . . 8 ⊢ ∅ ∈ 𝒫 𝐵
8	7	a1i 11	. . . . . . 7 ⊢ (𝜑 → ∅ ∈ 𝒫 𝐵)
9	6, 8	ffvelrnd 6846	. . . . . 6 ⊢ (𝜑 → (𝐼‘∅) ∈ 𝒫 𝐵)
10	9	elpwid 4552	. . . . 5 ⊢ (𝜑 → (𝐼‘∅) ⊆ 𝐵)
11		reldisj 4401	. . . . 5 ⊢ ((𝐼‘∅) ⊆ 𝐵 → (((𝐼‘∅) ∩ 𝐵) = ∅ ↔ (𝐼‘∅) ⊆ (𝐵 ∖ 𝐵)))
12	10, 11	syl 17	. . . 4 ⊢ (𝜑 → (((𝐼‘∅) ∩ 𝐵) = ∅ ↔ (𝐼‘∅) ⊆ (𝐵 ∖ 𝐵)))
13	12	bicomd 225	. . 3 ⊢ (𝜑 → ((𝐼‘∅) ⊆ (𝐵 ∖ 𝐵) ↔ ((𝐼‘∅) ∩ 𝐵) = ∅))
14		difid 4329	. . . . 5 ⊢ (𝐵 ∖ 𝐵) = ∅
15	14	sseq2i 3995	. . . 4 ⊢ ((𝐼‘∅) ⊆ (𝐵 ∖ 𝐵) ↔ (𝐼‘∅) ⊆ ∅)
16		ss0b 4350	. . . 4 ⊢ ((𝐼‘∅) ⊆ ∅ ↔ (𝐼‘∅) = ∅)
17	15, 16	bitri 277	. . 3 ⊢ ((𝐼‘∅) ⊆ (𝐵 ∖ 𝐵) ↔ (𝐼‘∅) = ∅)
18		disjr 4399	. . 3 ⊢ (((𝐼‘∅) ∩ 𝐵) = ∅ ↔ ∀𝑥 ∈ 𝐵 ¬ 𝑥 ∈ (𝐼‘∅))
19	13, 17, 18	3bitr3g 315	. 2 ⊢ (𝜑 → ((𝐼‘∅) = ∅ ↔ ∀𝑥 ∈ 𝐵 ¬ 𝑥 ∈ (𝐼‘∅)))
20	3	adantr 483	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐼𝐹𝑁)
21		simpr 487	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵)
22	7	a1i 11	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∅ ∈ 𝒫 𝐵)
23	1, 2, 20, 21, 22	ntrneiel 40424	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝑥 ∈ (𝐼‘∅) ↔ ∅ ∈ (𝑁‘𝑥)))
24	23	notbid 320	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (¬ 𝑥 ∈ (𝐼‘∅) ↔ ¬ ∅ ∈ (𝑁‘𝑥)))
25	24	ralbidva 3196	. 2 ⊢ (𝜑 → (∀𝑥 ∈ 𝐵 ¬ 𝑥 ∈ (𝐼‘∅) ↔ ∀𝑥 ∈ 𝐵 ¬ ∅ ∈ (𝑁‘𝑥)))
26	19, 25	bitrd 281	1 ⊢ (𝜑 → ((𝐼‘∅) = ∅ ↔ ∀𝑥 ∈ 𝐵 ¬ ∅ ∈ (𝑁‘𝑥)))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 208   ∧ wa 398   = wceq 1533   ∈ wcel 2110  ∀wral 3138  {crab 3142  Vcvv 3494   ∖ cdif 3932   ∩ cin 3934   ⊆ wss 3935  ∅c0 4290  𝒫 cpw 4538   class class class wbr 5058   ↦ cmpt 5138  ⟶wf 6345  ‘cfv 6349  (class class class)co 7150   ∈ cmpo 7152   ↑_m cmap 8400

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-rep 5182  ax-sep 5195  ax-nul 5202  ax-pow 5258  ax-pr 5321  ax-un 7455

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  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 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-pw 4540  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-iun 4913  df-br 5059  df-opab 5121  df-mpt 5139  df-id 5454  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-rn 5560  df-res 5561  df-ima 5562  df-iota 6308  df-fun 6351  df-fn 6352  df-f 6353  df-f1 6354  df-fo 6355  df-f1o 6356  df-fv 6357  df-ov 7153  df-oprab 7154  df-mpo 7155  df-1st 7683  df-2nd 7684  df-map 8402

This theorem is referenced by: (None)