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| Mirrors > Home > MPE Home > Th. List > restrcl | Structured version Visualization version GIF version | ||
| Description: Reverse closure for the subspace topology. (Contributed by Mario Carneiro, 19-Mar-2015.) (Revised by Mario Carneiro, 1-May-2015.) |
| Ref | Expression |
|---|---|
| restrcl | ⊢ ((𝐽 ↾t 𝐴) ∈ Top → (𝐽 ∈ V ∧ 𝐴 ∈ V)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0opn 23277 | . . 3 ⊢ ((𝐽 ↾t 𝐴) ∈ Top → ∅ ∈ (𝐽 ↾t 𝐴)) | |
| 2 | n0i 4289 | . . 3 ⊢ (∅ ∈ (𝐽 ↾t 𝐴) → ¬ (𝐽 ↾t 𝐴) = ∅) | |
| 3 | 1, 2 | syl 18 | . 2 ⊢ ((𝐽 ↾t 𝐴) ∈ Top → ¬ (𝐽 ↾t 𝐴) = ∅) |
| 4 | restfn 17645 | . . . 4 ⊢ ↾t Fn (V × V) | |
| 5 | 4 | fndmi 6673 | . . 3 ⊢ dom ↾t = (V × V) |
| 6 | 5 | ndmov 7637 | . 2 ⊢ (¬ (𝐽 ∈ V ∧ 𝐴 ∈ V) → (𝐽 ↾t 𝐴) = ∅) |
| 7 | 3, 6 | nsyl2 142 | 1 ⊢ ((𝐽 ↾t 𝐴) ∈ Top → (𝐽 ∈ V ∧ 𝐴 ∈ V)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2147 Vcvv 3454 ∅c0 4281 × cxp 5656 (class class class)co 7451 ↾t crest 17641 Topctop 23266 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-rep 5238 ax-sep 5255 ax-nul 5266 ax-pr 5398 ax-un 7783 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4841 df-uni 4873 df-iun 4958 df-br 5109 df-opab 5174 df-mpt 5193 df-id 5553 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-iota 6520 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-fv 6574 df-ov 7454 df-oprab 7455 df-mpo 7456 df-1st 8035 df-2nd 8036 df-rest 17643 df-top 23267 |
| This theorem is used by: cnrest2r 23660 imacmp 23770 fiuncmp 23777 conncompss 23806 kgeni 23911 kgencmp 23919 kgencmp2 23920 |
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