| 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 23448 | . . . . . 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 3175 | . 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 3089 ⊆ wss 3899 ‘cfv 6546 Topctop 23223 neicnei 23427 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-rep 5234 ax-sep 5251 ax-nul 5262 ax-pow 5330 ax-pr 5394 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-reu 3369 df-rab 3416 df-v 3455 df-sbc 3742 df-csb 3851 df-ss 3900 df-dif 4049 df-in 4093 df-un 4153 df-nul 4281 df-if 4485 df-pw 4561 df-sn 4588 df-pr 4590 df-op 4838 df-uni 4870 df-iun 4955 df-br 5106 df-opab 5170 df-mpt 5189 df-id 5549 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-iota 6500 df-fun 6548 df-fn 6549 df-f 6550 df-f1 6551 df-fo 6552 df-f1o 6553 df-fv 6554 df-top 23224 df-nei 23428 |
| This theorem is used by: opnneirv 50161 opnneibid 50164 |
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