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Mirrors > Home > MPE Home > Th. List > Mathboxes > ontgsucval | Structured version Visualization version GIF version |
Description: The topology generated from a successor ordinal number is itself. (Contributed by Chen-Pang He, 11-Oct-2015.) |
Ref | Expression |
---|---|
ontgsucval | ⊢ (𝐴 ∈ On → (topGen‘suc 𝐴) = suc 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | suceloni 7531 | . . 3 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ On) | |
2 | ontgval 33783 | . . 3 ⊢ (suc 𝐴 ∈ On → (topGen‘suc 𝐴) = suc ∪ suc 𝐴) | |
3 | 1, 2 | syl 17 | . 2 ⊢ (𝐴 ∈ On → (topGen‘suc 𝐴) = suc ∪ suc 𝐴) |
4 | eloni 6204 | . . . 4 ⊢ (𝐴 ∈ On → Ord 𝐴) | |
5 | ordunisuc 7550 | . . . 4 ⊢ (Ord 𝐴 → ∪ suc 𝐴 = 𝐴) | |
6 | 4, 5 | syl 17 | . . 3 ⊢ (𝐴 ∈ On → ∪ suc 𝐴 = 𝐴) |
7 | suceq 6259 | . . 3 ⊢ (∪ suc 𝐴 = 𝐴 → suc ∪ suc 𝐴 = suc 𝐴) | |
8 | 6, 7 | syl 17 | . 2 ⊢ (𝐴 ∈ On → suc ∪ suc 𝐴 = suc 𝐴) |
9 | 3, 8 | eqtrd 2859 | 1 ⊢ (𝐴 ∈ On → (topGen‘suc 𝐴) = suc 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1536 ∈ wcel 2113 ∪ cuni 4841 Ord word 6193 Oncon0 6194 suc csuc 6196 ‘cfv 6358 topGenctg 16714 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 ax-nul 5213 ax-pow 5269 ax-pr 5333 ax-un 7464 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-ral 3146 df-rex 3147 df-rab 3150 df-v 3499 df-sbc 3776 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-pss 3957 df-nul 4295 df-if 4471 df-pw 4544 df-sn 4571 df-pr 4573 df-tp 4575 df-op 4577 df-uni 4842 df-br 5070 df-opab 5132 df-mpt 5150 df-tr 5176 df-id 5463 df-eprel 5468 df-po 5477 df-so 5478 df-fr 5517 df-we 5519 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-ord 6197 df-on 6198 df-suc 6200 df-iota 6317 df-fun 6360 df-fv 6366 df-topgen 16720 |
This theorem is referenced by: onsuctop 33785 |
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