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| Mirrors > Home > MPE Home > Th. List > Mathboxes > toprestsubel | Structured version Visualization version GIF version | ||
| Description: A subset is open in the topology it generates via restriction. (Contributed by Glauco Siliprandi, 21-Dec-2024.) |
| Ref | Expression |
|---|---|
| toprestsubel.1 | ⊢ (𝜑 → 𝐽 ∈ Top) |
| toprestsubel.2 | ⊢ (𝜑 → 𝐴 ⊆ ∪ 𝐽) |
| Ref | Expression |
|---|---|
| toprestsubel | ⊢ (𝜑 → 𝐴 ∈ (𝐽 ↾t 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | toprestsubel.1 | . 2 ⊢ (𝜑 → 𝐽 ∈ Top) | |
| 2 | eqid 2729 | . . . 4 ⊢ ∪ 𝐽 = ∪ 𝐽 | |
| 3 | 2 | topopn 22769 | . . 3 ⊢ (𝐽 ∈ Top → ∪ 𝐽 ∈ 𝐽) |
| 4 | 1, 3 | syl 17 | . 2 ⊢ (𝜑 → ∪ 𝐽 ∈ 𝐽) |
| 5 | toprestsubel.2 | . 2 ⊢ (𝜑 → 𝐴 ⊆ ∪ 𝐽) | |
| 6 | 1, 4, 5 | restsubel 45120 | 1 ⊢ (𝜑 → 𝐴 ∈ (𝐽 ↾t 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2109 ⊆ wss 3911 ∪ cuni 4867 (class class class)co 7369 ↾t crest 17359 Topctop 22756 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-rep 5229 ax-sep 5246 ax-nul 5256 ax-pr 5382 ax-un 7691 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-reu 3352 df-rab 3403 df-v 3446 df-sbc 3751 df-csb 3860 df-dif 3914 df-un 3916 df-in 3918 df-ss 3928 df-nul 4293 df-if 4485 df-pw 4561 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4868 df-iun 4953 df-br 5103 df-opab 5165 df-mpt 5184 df-id 5526 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6452 df-fun 6501 df-fn 6502 df-f 6503 df-f1 6504 df-fo 6505 df-f1o 6506 df-fv 6507 df-ov 7372 df-oprab 7373 df-mpo 7374 df-rest 17361 df-top 22757 |
| This theorem is referenced by: (None) |
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