| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 4698 |
. 2
| |
| 2 | nnfi 7102 |
. 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-nul 4220 ax-pow 4270 ax-pr 4305 ax-un 4536 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ral 2516 df-rex 2517 df-v 2805 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-int 3934 df-br 4094 df-opab 4156 df-id 4396 df-iom 4695 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-rn 4742 df-res 4743 df-ima 4744 df-fun 5335 df-fn 5336 df-f 5337 df-f1 5338 df-fo 5339 df-f1o 5340 df-en 6953 df-fin 6955 |
| This theorem is referenced by: xpfi 7167 ssfirab 7172 fnfi 7178 iunfidisj 7188 fidcenumlemr 7197 fzfig 10738 fihasheq0 11101 hash0 11104 fczpsrbag 14750 uhgr0enedgfi 16160 vtxdgfi0e 16219 |
| Copyright terms: Public domain | W3C validator |