Mathbox for Chen-Pang He |
< Previous
Next >
Nearby theorems |
||
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 6242 | . . 3 ⊢ (𝐴 = if(𝐴 ∈ On, 𝐴, ∅) → suc 𝐴 = suc if(𝐴 ∈ On, 𝐴, ∅)) | |
2 | 1 | eleq1d 2897 | . 2 ⊢ (𝐴 = if(𝐴 ∈ On, 𝐴, ∅) → (suc 𝐴 ∈ Conn ↔ suc if(𝐴 ∈ On, 𝐴, ∅) ∈ Conn)) |
3 | 0elon 6230 | . . . 4 ⊢ ∅ ∈ On | |
4 | 3 | elimel 4520 | . . 3 ⊢ if(𝐴 ∈ On, 𝐴, ∅) ∈ On |
5 | 4 | onsucconni 33792 | . 2 ⊢ suc if(𝐴 ∈ On, 𝐴, ∅) ∈ Conn |
6 | 2, 5 | dedth 4509 | 1 ⊢ (𝐴 ∈ On → suc 𝐴 ∈ Conn) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ∈ wcel 2114 ∅c0 4279 ifcif 4453 Oncon0 6177 suc csuc 6179 Conncconn 22002 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5189 ax-nul 5196 ax-pow 5252 ax-pr 5316 ax-un 7447 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3488 df-sbc 3764 df-dif 3927 df-un 3929 df-in 3931 df-ss 3940 df-pss 3942 df-nul 4280 df-if 4454 df-pw 4527 df-sn 4554 df-pr 4556 df-tp 4558 df-op 4560 df-uni 4825 df-br 5053 df-opab 5115 df-mpt 5133 df-tr 5159 df-id 5446 df-eprel 5451 df-po 5460 df-so 5461 df-fr 5500 df-we 5502 df-xp 5547 df-rel 5548 df-cnv 5549 df-co 5550 df-dm 5551 df-ord 6180 df-on 6181 df-suc 6183 df-iota 6300 df-fun 6343 df-fn 6344 df-fv 6349 df-topgen 16700 df-top 21485 df-bases 21537 df-cld 21610 df-conn 22003 |
This theorem is referenced by: ordtopconn 33794 |
Copyright terms: Public domain | W3C validator |