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| Mirrors > Home > MPE Home > Th. List > 0cmp | Structured version Visualization version GIF version | ||
| Description: The singleton of the empty set is compact. (Contributed by FL, 2-Aug-2009.) |
| Ref | Expression |
|---|---|
| 0cmp | ⊢ {∅} ∈ Comp |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sn0top 22886 | . . 3 ⊢ {∅} ∈ Top | |
| 2 | snfi 9014 | . . 3 ⊢ {∅} ∈ Fin | |
| 3 | 1, 2 | elini 4162 | . 2 ⊢ {∅} ∈ (Top ∩ Fin) |
| 4 | fincmp 23280 | . 2 ⊢ ({∅} ∈ (Top ∩ Fin) → {∅} ∈ Comp) | |
| 5 | 3, 4 | ax-mp 5 | 1 ⊢ {∅} ∈ Comp |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2109 ∩ cin 3913 ∅c0 4296 {csn 4589 Fincfn 8918 Topctop 22780 Compccmp 23273 |
| 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 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pow 5320 ax-pr 5387 ax-un 7711 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-ral 3045 df-rex 3054 df-reu 3355 df-rab 3406 df-v 3449 df-sbc 3754 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-pss 3934 df-nul 4297 df-if 4489 df-pw 4565 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4872 df-br 5108 df-opab 5170 df-mpt 5189 df-tr 5215 df-id 5533 df-eprel 5538 df-po 5546 df-so 5547 df-fr 5591 df-we 5593 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-res 5650 df-ima 5651 df-ord 6335 df-on 6336 df-lim 6337 df-suc 6338 df-iota 6464 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-fv 6519 df-om 7843 df-1o 8434 df-en 8919 df-fin 8922 df-top 22781 df-topon 22798 df-cmp 23274 |
| This theorem is referenced by: fiuncmp 23291 xkouni 23486 icccmp 24714 zarcmplem 33871 ordcmp 36435 |
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