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| Mirrors > Home > MPE Home > Th. List > Mathboxes > ntrneicls11 | Structured version Visualization version GIF version | ||
| 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.) |
| 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) |
| Ref | Expression |
|---|---|
| ntrneicls11 | ⊢ (𝜑 → ((𝐼‘∅) = ∅ ↔ ∀𝑥 ∈ 𝐵 ¬ ∅ ∈ (𝑁‘𝑥))) |
| 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 44657 | . . . . . . . 8 ⊢ (𝜑 → 𝐼 ∈ (𝒫 𝐵 ↑m 𝒫 𝐵)) |
| 5 | elmapi 8832 | . . . . . . . 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 5314 | . . . . . . . 8 ⊢ ∅ ∈ 𝒫 𝐵 | |
| 8 | 7 | a1i 11 | . . . . . . 7 ⊢ (𝜑 → ∅ ∈ 𝒫 𝐵) |
| 9 | 6, 8 | ffvelcdmd 7068 | . . . . . 6 ⊢ (𝜑 → (𝐼‘∅) ∈ 𝒫 𝐵) |
| 10 | 9 | elpwid 4566 | . . . . 5 ⊢ (𝜑 → (𝐼‘∅) ⊆ 𝐵) |
| 11 | reldisj 4409 | . . . . 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 4331 | . . . . 5 ⊢ (𝐵 ∖ 𝐵) = ∅ | |
| 15 | 14 | sseq2i 3967 | . . . 4 ⊢ ((𝐼‘∅) ⊆ (𝐵 ∖ 𝐵) ↔ (𝐼‘∅) ⊆ ∅) |
| 16 | ss0b 4357 | . . . 4 ⊢ ((𝐼‘∅) ⊆ ∅ ↔ (𝐼‘∅) = ∅) | |
| 17 | 15, 16 | bitri 277 | . . 3 ⊢ ((𝐼‘∅) ⊆ (𝐵 ∖ 𝐵) ↔ (𝐼‘∅) = ∅) |
| 18 | disjr 4407 | . . 3 ⊢ (((𝐼‘∅) ∩ 𝐵) = ∅ ↔ ∀𝑥 ∈ 𝐵 ¬ 𝑥 ∈ (𝐼‘∅)) | |
| 19 | 13, 17, 18 | 3bitr3g 315 | . 2 ⊢ (𝜑 → ((𝐼‘∅) = ∅ ↔ ∀𝑥 ∈ 𝐵 ¬ 𝑥 ∈ (𝐼‘∅))) |
| 20 | 3 | adantr 484 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝐼𝐹𝑁) |
| 21 | simpr 488 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → 𝑥 ∈ 𝐵) | |
| 22 | 7 | a1i 11 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∅ ∈ 𝒫 𝐵) |
| 23 | 1, 2, 20, 21, 22 | ntrneiel 44662 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (𝑥 ∈ (𝐼‘∅) ↔ ∅ ∈ (𝑁‘𝑥))) |
| 24 | 23 | notbid 320 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (¬ 𝑥 ∈ (𝐼‘∅) ↔ ¬ ∅ ∈ (𝑁‘𝑥))) |
| 25 | 24 | ralbidva 3185 | . 2 ⊢ (𝜑 → (∀𝑥 ∈ 𝐵 ¬ 𝑥 ∈ (𝐼‘∅) ↔ ∀𝑥 ∈ 𝐵 ¬ ∅ ∈ (𝑁‘𝑥))) |
| 26 | 19, 25 | bitrd 281 | 1 ⊢ (𝜑 → ((𝐼‘∅) = ∅ ↔ ∀𝑥 ∈ 𝐵 ¬ ∅ ∈ (𝑁‘𝑥))) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 208 ∧ wa 399 = wceq 1562 ∈ wcel 2144 ∀wral 3078 {crab 3416 Vcvv 3456 ∖ cdif 3903 ∩ cin 3905 ⊆ wss 3906 ∅c0 4287 𝒫 cpw 4557 class class class wbr 5102 ↦ cmpt 5183 ⟶wf 6519 ‘cfv 6523 (class class class)co 7398 ∈ cmpo 7400 ↑m cmap 8810 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2214 ax-ext 2736 ax-rep 5229 ax-sep 5248 ax-nul 5258 ax-pow 5324 ax-pr 5392 ax-un 7720 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-nf 1806 df-sb 2093 df-mo 2568 df-eu 2598 df-clab 2743 df-cleq 2756 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3079 df-rex 3089 df-reu 3370 df-rab 3417 df-v 3458 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-id 5544 df-xp 5655 df-rel 5656 df-cnv 5657 df-co 5658 df-dm 5659 df-rn 5660 df-res 5661 df-ima 5662 df-iota 6479 df-fun 6525 df-fn 6526 df-f 6527 df-f1 6528 df-fo 6529 df-f1o 6530 df-fv 6531 df-ov 7401 df-oprab 7402 df-mpo 7403 df-1st 7972 df-2nd 7973 df-map 8812 |
| This theorem is referenced by: (None) |
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