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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 23117 | . . 3 ⊢ {∅} ∈ Top | |
| 2 | snfi 9028 | . . 3 ⊢ {∅} ∈ Fin | |
| 3 | 1, 2 | elini 4154 | . 2 ⊢ {∅} ∈ (Top ∩ Fin) |
| 4 | fincmp 23511 | . 2 ⊢ ({∅} ∈ (Top ∩ Fin) → {∅} ∈ Comp) | |
| 5 | 3, 4 | ax-mp 5 | 1 ⊢ {∅} ∈ Comp |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2145 ∩ cin 3906 ∅c0 4288 {csn 4585 Fincfn 8931 Topctop 23011 Compccmp 23504 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-sep 5251 ax-nul 5261 ax-pow 5327 ax-pr 5395 ax-un 7722 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-ral 3080 df-rex 3090 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4869 df-br 5106 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5547 df-eprel 5552 df-po 5560 df-so 5561 df-fr 5605 df-we 5607 df-xp 5658 df-rel 5659 df-cnv 5660 df-co 5661 df-dm 5662 df-rn 5663 df-res 5664 df-ima 5665 df-ord 6353 df-on 6354 df-lim 6355 df-suc 6356 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-om 7851 df-1o 8441 df-en 8932 df-fin 8935 df-top 23012 df-topon 23029 df-cmp 23505 |
| This theorem is referenced by: fiuncmp 23522 xkouni 23717 icccmp 24944 zarcmplem 34188 ordcmp 36820 |
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