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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 23121 | . . . . 5 ⊢ ((𝐽 ∈ Top ∧ 𝐴 ∈ 𝐽) → (𝑥 ∈ (𝐽 ↾t 𝐴) ↔ (𝑥 ∈ 𝐽 ∧ 𝑥 ⊆ 𝐴))) | |
| 7 | 3, 5, 6 | syl2anc 584 | . . . 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 45325 | 1 ⊢ (𝜑 → (𝐽 ↾t 𝐴) ⊆ 𝐽) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∈ wcel 2113 ⊆ wss 3901 (class class class)co 7358 ↾t crest 17340 Topctop 22837 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2184 ax-ext 2708 ax-rep 5224 ax-sep 5241 ax-nul 5251 ax-pow 5310 ax-pr 5377 ax-un 7680 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3061 df-reu 3351 df-rab 3400 df-v 3442 df-sbc 3741 df-csb 3850 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-pss 3921 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4581 df-pr 4583 df-op 4587 df-uni 4864 df-int 4903 df-iun 4948 df-br 5099 df-opab 5161 df-mpt 5180 df-tr 5206 df-id 5519 df-eprel 5524 df-po 5532 df-so 5533 df-fr 5577 df-we 5579 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-ov 7361 df-oprab 7362 df-mpo 7363 df-om 7809 df-1st 7933 df-2nd 7934 df-en 8884 df-fin 8887 df-fi 9314 df-rest 17342 df-topgen 17363 df-top 22838 df-topon 22855 df-bases 22890 |
| This theorem is referenced by: (None) |
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