| Mathbox for Zhi Wang |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > opnneir | Structured version Visualization version GIF version | ||
| Description: If something is true for an open neighborhood, it must be true for a neighborhood. (Contributed by Zhi Wang, 31-Aug-2024.) |
| Ref | Expression |
|---|---|
| opnneir.1 | ⊢ (𝜑 → 𝐽 ∈ Top) |
| Ref | Expression |
|---|---|
| opnneir | ⊢ (𝜑 → (∃𝑥 ∈ 𝐽 (𝑆 ⊆ 𝑥 ∧ 𝜓) → ∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opnneir.1 | . 2 ⊢ (𝜑 → 𝐽 ∈ Top) | |
| 2 | anass 474 | . . . 4 ⊢ (((𝑥 ∈ 𝐽 ∧ 𝑆 ⊆ 𝑥) ∧ 𝜓) ↔ (𝑥 ∈ 𝐽 ∧ (𝑆 ⊆ 𝑥 ∧ 𝜓))) | |
| 3 | opnneiss 23327 | . . . . . 6 ⊢ ((𝐽 ∈ Top ∧ 𝑥 ∈ 𝐽 ∧ 𝑆 ⊆ 𝑥) → 𝑥 ∈ ((nei‘𝐽)‘𝑆)) | |
| 4 | 3 | 3expib 1140 | . . . . 5 ⊢ (𝐽 ∈ Top → ((𝑥 ∈ 𝐽 ∧ 𝑆 ⊆ 𝑥) → 𝑥 ∈ ((nei‘𝐽)‘𝑆))) |
| 5 | 4 | anim1d 623 | . . . 4 ⊢ (𝐽 ∈ Top → (((𝑥 ∈ 𝐽 ∧ 𝑆 ⊆ 𝑥) ∧ 𝜓) → (𝑥 ∈ ((nei‘𝐽)‘𝑆) ∧ 𝜓))) |
| 6 | 2, 5 | biimtrrid 246 | . . 3 ⊢ (𝐽 ∈ Top → ((𝑥 ∈ 𝐽 ∧ (𝑆 ⊆ 𝑥 ∧ 𝜓)) → (𝑥 ∈ ((nei‘𝐽)‘𝑆) ∧ 𝜓))) |
| 7 | 6 | reximdv2 3177 | . 2 ⊢ (𝐽 ∈ Top → (∃𝑥 ∈ 𝐽 (𝑆 ⊆ 𝑥 ∧ 𝜓) → ∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓)) |
| 8 | 1, 7 | syl 18 | 1 ⊢ (𝜑 → (∃𝑥 ∈ 𝐽 (𝑆 ⊆ 𝑥 ∧ 𝜓) → ∃𝑥 ∈ ((nei‘𝐽)‘𝑆)𝜓)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 ∈ wcel 2146 ∃wrex 3091 ⊆ wss 3906 ‘cfv 6540 Topctop 23102 neicnei 23306 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-rep 5240 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-iun 4960 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-top 23103 df-nei 23307 |
| This theorem is used by: opnneirv 49745 opnneieqv 49748 |
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