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Mirrors > Home > MPE Home > Th. List > Mathboxes > onsuctop | Structured version Visualization version GIF version |
Description: A successor ordinal number is a topology. (Contributed by Chen-Pang He, 11-Oct-2015.) |
Ref | Expression |
---|---|
onsuctop | ⊢ (𝐴 ∈ On → suc 𝐴 ∈ Top) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ontgsucval 31601 | . 2 ⊢ (𝐴 ∈ On → (topGen‘suc 𝐴) = suc 𝐴) | |
2 | suceloni 6905 | . . 3 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ On) | |
3 | ontopbas 31597 | . . 3 ⊢ (suc 𝐴 ∈ On → suc 𝐴 ∈ TopBases) | |
4 | tgcl 20584 | . . 3 ⊢ (suc 𝐴 ∈ TopBases → (topGen‘suc 𝐴) ∈ Top) | |
5 | 2, 3, 4 | 3syl 18 | . 2 ⊢ (𝐴 ∈ On → (topGen‘suc 𝐴) ∈ Top) |
6 | 1, 5 | eqeltrrd 2689 | 1 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ Top) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∈ wcel 1977 Oncon0 5640 suc csuc 5642 ‘cfv 5804 topGenctg 15921 Topctop 20517 TopBasesctb 20520 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-sbc 3403 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-ord 5643 df-on 5644 df-suc 5646 df-iota 5768 df-fun 5806 df-fv 5812 df-topgen 15927 df-top 20521 df-bases 20522 |
This theorem is referenced by: onsuctopon 31603 ordtop 31605 onsucconi 31606 onsucsuccmpi 31612 |
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