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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 22931 | . . 3 ⊢ ((𝐽 ↾t 𝐴) ∈ Top → ∅ ∈ (𝐽 ↾t 𝐴)) | |
2 | n0i 4363 | . . 3 ⊢ (∅ ∈ (𝐽 ↾t 𝐴) → ¬ (𝐽 ↾t 𝐴) = ∅) | |
3 | 1, 2 | syl 17 | . 2 ⊢ ((𝐽 ↾t 𝐴) ∈ Top → ¬ (𝐽 ↾t 𝐴) = ∅) |
4 | restfn 17484 | . . . 4 ⊢ ↾t Fn (V × V) | |
5 | 4 | fndmi 6683 | . . 3 ⊢ dom ↾t = (V × V) |
6 | 5 | ndmov 7634 | . 2 ⊢ (¬ (𝐽 ∈ V ∧ 𝐴 ∈ V) → (𝐽 ↾t 𝐴) = ∅) |
7 | 3, 6 | nsyl2 141 | 1 ⊢ ((𝐽 ↾t 𝐴) ∈ Top → (𝐽 ∈ V ∧ 𝐴 ∈ V)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1537 ∈ wcel 2108 Vcvv 3488 ∅c0 4352 × cxp 5698 (class class class)co 7448 ↾t crest 17480 Topctop 22920 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2158 ax-12 2178 ax-ext 2711 ax-rep 5303 ax-sep 5317 ax-nul 5324 ax-pr 5447 ax-un 7770 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2543 df-eu 2572 df-clab 2718 df-cleq 2732 df-clel 2819 df-nfc 2895 df-ne 2947 df-ral 3068 df-rex 3077 df-reu 3389 df-rab 3444 df-v 3490 df-sbc 3805 df-csb 3922 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-nul 4353 df-if 4549 df-pw 4624 df-sn 4649 df-pr 4651 df-op 4655 df-uni 4932 df-iun 5017 df-br 5167 df-opab 5229 df-mpt 5250 df-id 5593 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-res 5712 df-ima 5713 df-iota 6525 df-fun 6575 df-fn 6576 df-f 6577 df-f1 6578 df-fo 6579 df-f1o 6580 df-fv 6581 df-ov 7451 df-oprab 7452 df-mpo 7453 df-1st 8030 df-2nd 8031 df-rest 17482 df-top 22921 |
This theorem is referenced by: cnrest2r 23316 imacmp 23426 fiuncmp 23433 conncompss 23462 kgeni 23566 kgencmp 23574 kgencmp2 23575 |
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