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| Mirrors > Home > MPE Home > Th. List > Mathboxes > restopnssd | Structured version Visualization version GIF version | ||
| Description: A topology restricted to an open set is a subset of the original topology. (Contributed by Glauco Siliprandi, 21-Dec-2024.) |
| Ref | Expression |
|---|---|
| restopnssd.1 | ⊢ (𝜑 → 𝐽 ∈ Top) |
| restopnssd.2 | ⊢ (𝜑 → 𝐴 ∈ 𝐽) |
| Ref | Expression |
|---|---|
| restopnssd | ⊢ (𝜑 → (𝐽 ↾t 𝐴) ⊆ 𝐽) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simpr 484 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐽 ↾t 𝐴)) → 𝑥 ∈ (𝐽 ↾t 𝐴)) | |
| 2 | restopnssd.1 | . . . . . 6 ⊢ (𝜑 → 𝐽 ∈ Top) | |
| 3 | 2 | adantr 480 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐽 ↾t 𝐴)) → 𝐽 ∈ Top) |
| 4 | restopnssd.2 | . . . . . 6 ⊢ (𝜑 → 𝐴 ∈ 𝐽) | |
| 5 | 4 | adantr 480 | . . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐽 ↾t 𝐴)) → 𝐴 ∈ 𝐽) |
| 6 | restopn2 23133 | . . . . 5 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ∈ 𝐽) → (𝑥 ∈ (𝐽 ↾t 𝐴) ↔ (𝑥 ∈ 𝐽 ∧ 𝑥 ⊆ 𝐴))) | |
| 7 | 3, 5, 6 | syl2anc 585 | . . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐽 ↾t 𝐴)) → (𝑥 ∈ (𝐽 ↾t 𝐴) ↔ (𝑥 ∈ 𝐽 ∧ 𝑥 ⊆ 𝐴))) |
| 8 | 1, 7 | mpbid 232 | . . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐽 ↾t 𝐴)) → (𝑥 ∈ 𝐽 ∧ 𝑥 ⊆ 𝐴)) |
| 9 | 8 | simpld 494 | . 2 ⊢ ((𝜑 ∧ 𝑥 ∈ (𝐽 ↾t 𝐴)) → 𝑥 ∈ 𝐽) |
| 10 | 9 | ssd 45437 | 1 ⊢ (𝜑 → (𝐽 ↾t 𝐴) ⊆ 𝐽) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∈ wcel 2114 ⊆ wss 3903 (class class class)co 7368 ↾t crest 17352 Topctop 22849 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-1st 7943 df-2nd 7944 df-en 8896 df-fin 8899 df-fi 9326 df-rest 17354 df-topgen 17375 df-top 22850 df-topon 22867 df-bases 22902 |
| This theorem is referenced by: (None) |
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