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| Mirrors > Home > ILE Home > Th. List > 0fi | Unicode version | ||
| Description: The empty set is finite. (Contributed by FL, 14-Jul-2008.) |
| Ref | Expression |
|---|---|
| 0fi |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | peano1 4736 |
. 2
| |
| 2 | nnfi 7164 |
. 2
| |
| 3 | 1, 2 | ax-mp 5 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 ax-un 4573 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ral 2533 df-rex 2534 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-br 4126 df-opab 4188 df-id 4433 df-iom 4733 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-rn 4780 df-res 4781 df-ima 4782 df-fun 5374 df-fn 5375 df-f 5376 df-f1 5377 df-fo 5378 df-f1o 5379 df-en 7013 df-fin 7015 |
| This theorem is referenced by: xpfi 7229 ssfirab 7234 fnfi 7240 iunfidisj 7250 fidcenumlemr 7262 fczfsuppd 7287 0fsupp 7288 snopfsuppdc 7289 fzfig 10845 fihasheq0 11210 hash0 11213 hashfibc 11261 hashf1lem2 11264 fczpsrbag 14979 uhgr0enedgfi 16391 vtxdgfi0e 16450 |
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