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Mirrors > Home > MPE Home > Th. List > Mathboxes > onsucconn | Structured version Visualization version GIF version |
Description: A successor ordinal number is a connected topology. (Contributed by Chen-Pang He, 16-Oct-2015.) |
Ref | Expression |
---|---|
onsucconn | ⊢ (𝐴 ∈ On → suc 𝐴 ∈ Conn) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | suceq 6452 | . . 3 ⊢ (𝐴 = if(𝐴 ∈ On, 𝐴, ∅) → suc 𝐴 = suc if(𝐴 ∈ On, 𝐴, ∅)) | |
2 | 1 | eleq1d 2824 | . 2 ⊢ (𝐴 = if(𝐴 ∈ On, 𝐴, ∅) → (suc 𝐴 ∈ Conn ↔ suc if(𝐴 ∈ On, 𝐴, ∅) ∈ Conn)) |
3 | 0elon 6440 | . . . 4 ⊢ ∅ ∈ On | |
4 | 3 | elimel 4600 | . . 3 ⊢ if(𝐴 ∈ On, 𝐴, ∅) ∈ On |
5 | 4 | onsucconni 36420 | . 2 ⊢ suc if(𝐴 ∈ On, 𝐴, ∅) ∈ Conn |
6 | 2, 5 | dedth 4589 | 1 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ Conn) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2106 ∅c0 4339 ifcif 4531 Oncon0 6386 suc csuc 6388 Conncconn 23435 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-rab 3434 df-v 3480 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-op 4638 df-uni 4913 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-ord 6389 df-on 6390 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-fv 6571 df-topgen 17490 df-top 22916 df-bases 22969 df-cld 23043 df-conn 23436 |
This theorem is referenced by: ordtopconn 36422 |
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