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| Mirrors > Home > MPE Home > Th. List > Mathboxes > limsucncmp | Structured version Visualization version GIF version | ||
| Description: The successor of a limit ordinal is not compact. (Contributed by Chen-Pang He, 20-Oct-2015.) |
| Ref | Expression |
|---|---|
| limsucncmp | ⊢ (Lim 𝐴 → ¬ suc 𝐴 ∈ Comp) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | suceq 6434 | . . . 4 ⊢ (𝐴 = if(Lim 𝐴, 𝐴, On) → suc 𝐴 = suc if(Lim 𝐴, 𝐴, On)) | |
| 2 | 1 | eleq1d 2845 | . . 3 ⊢ (𝐴 = if(Lim 𝐴, 𝐴, On) → (suc 𝐴 ∈ Comp ↔ suc if(Lim 𝐴, 𝐴, On) ∈ Comp)) |
| 3 | 2 | notbid 321 | . 2 ⊢ (𝐴 = if(Lim 𝐴, 𝐴, On) → (¬ suc 𝐴 ∈ Comp ↔ ¬ suc if(Lim 𝐴, 𝐴, On) ∈ Comp)) |
| 4 | limeq 6377 | . . . 4 ⊢ (𝐴 = if(Lim 𝐴, 𝐴, On) → (Lim 𝐴 ↔ Lim if(Lim 𝐴, 𝐴, On))) | |
| 5 | limeq 6377 | . . . 4 ⊢ (On = if(Lim 𝐴, 𝐴, On) → (Lim On ↔ Lim if(Lim 𝐴, 𝐴, On))) | |
| 6 | limon 7851 | . . . 4 ⊢ Lim On | |
| 7 | 4, 5, 6 | elimhyp 4547 | . . 3 ⊢ Lim if(Lim 𝐴, 𝐴, On) |
| 8 | 7 | limsucncmpi 37357 | . 2 ⊢ ¬ suc if(Lim 𝐴, 𝐴, On) ∈ Comp |
| 9 | 3, 8 | dedth 4540 | 1 ⊢ (Lim 𝐴 → ¬ suc 𝐴 ∈ Comp) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 = wceq 1569 ∈ wcel 2144 ifcif 4481 Oncon0 6365 Lim wlim 6366 suc csuc 6367 Compccmp 23713 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pr 5391 ax-un 7755 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-ss 3897 df-pss 4013 df-dif 4046 df-in 4090 df-un 4150 df-nul 4278 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-br 5103 df-opab 5167 df-tr 5212 df-id 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6497 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-fv 6551 df-om 7882 df-en 8982 df-fin 8985 df-cmp 23714 |
| This theorem is used by: ordcmp 37359 |
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