Mathbox for Chen-Pang He |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > Mathboxes > onsuctopon | Structured version Visualization version GIF version |
Description: One of the topologies on an ordinal number is its successor. (Contributed by Chen-Pang He, 7-Nov-2015.) |
Ref | Expression |
---|---|
onsuctopon | ⊢ (𝐴 ∈ On → suc 𝐴 ∈ (TopOn‘𝐴)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | onsuctop 34316 | . 2 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ Top) | |
2 | eloni 6212 | . . 3 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
3 | ordunisuc 7600 | . . . 4 ⊢ (Ord 𝐴 → ∪ suc 𝐴 = 𝐴) | |
4 | 3 | eqcomd 2740 | . . 3 ⊢ (Ord 𝐴 → 𝐴 = ∪ suc 𝐴) |
5 | 2, 4 | syl 17 | . 2 ⊢ (𝐴 ∈ On → 𝐴 = ∪ suc 𝐴) |
6 | istopon 21781 | . 2 ⊢ (suc 𝐴 ∈ (TopOn‘𝐴) ↔ (suc 𝐴 ∈ Top ∧ 𝐴 = ∪ suc 𝐴)) | |
7 | 1, 5, 6 | sylanbrc 586 | 1 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ (TopOn‘𝐴)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1543 ∈ wcel 2110 ∪ cuni 4809 Ord word 6201 Oncon0 6202 suc csuc 6204 ‘cfv 6369 Topctop 21762 TopOnctopon 21779 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2706 ax-sep 5181 ax-nul 5188 ax-pow 5247 ax-pr 5311 ax-un 7512 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2537 df-eu 2566 df-clab 2713 df-cleq 2726 df-clel 2812 df-nfc 2882 df-ne 2936 df-ral 3059 df-rex 3060 df-rab 3063 df-v 3403 df-sbc 3688 df-dif 3860 df-un 3862 df-in 3864 df-ss 3874 df-pss 3876 df-nul 4228 df-if 4430 df-pw 4505 df-sn 4532 df-pr 4534 df-tp 4536 df-op 4538 df-uni 4810 df-br 5044 df-opab 5106 df-mpt 5125 df-tr 5151 df-id 5444 df-eprel 5449 df-po 5457 df-so 5458 df-fr 5498 df-we 5500 df-xp 5546 df-rel 5547 df-cnv 5548 df-co 5549 df-dm 5550 df-ord 6205 df-on 6206 df-suc 6208 df-iota 6327 df-fun 6371 df-fv 6377 df-topgen 16920 df-top 21763 df-topon 21780 df-bases 21815 |
This theorem is referenced by: onsuct0 34324 |
Copyright terms: Public domain | W3C validator |