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Mirrors > Home > ILE Home > Th. List > 0fin | GIF version |
Description: The empty set is finite. (Contributed by FL, 14-Jul-2008.) |
Ref | Expression |
---|---|
0fin | ⊢ ∅ ∈ Fin |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | peano1 4565 | . 2 ⊢ ∅ ∈ ω | |
2 | nnfi 6829 | . 2 ⊢ (∅ ∈ ω → ∅ ∈ Fin) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ ∅ ∈ Fin |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 2135 ∅c0 3404 ωcom 4561 Fincfn 6697 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-13 2137 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-nul 4102 ax-pow 4147 ax-pr 4181 ax-un 4405 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ral 2447 df-rex 2448 df-v 2723 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-nul 3405 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-int 3819 df-br 3977 df-opab 4038 df-id 4265 df-iom 4562 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-rn 4609 df-res 4610 df-ima 4611 df-fun 5184 df-fn 5185 df-f 5186 df-f1 5187 df-fo 5188 df-f1o 5189 df-en 6698 df-fin 6700 |
This theorem is referenced by: xpfi 6886 ssfirab 6890 fnfi 6893 iunfidisj 6902 fidcenumlemr 6911 fzfig 10355 fihasheq0 10696 hash0 10699 |
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