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Mirrors > Home > ILE Home > Th. List > ss0 | Unicode version |
Description: Any subset of the empty set is empty. Theorem 5 of [Suppes] p. 23. (Contributed by NM, 13-Aug-1994.) |
Ref | Expression |
---|---|
ss0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ss0b 3397 | . 2 | |
2 | 1 | biimpi 119 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wceq 1331 wss 3066 c0 3358 |
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 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-dif 3068 df-in 3072 df-ss 3079 df-nul 3359 |
This theorem is referenced by: sseq0 3399 abf 3401 eq0rdv 3402 ssdisj 3414 0dif 3429 poirr2 4926 iotanul 5098 f00 5309 map0b 6574 phplem2 6740 php5dom 6750 sbthlem7 6844 fi0 6856 casefun 6963 caseinj 6967 djufun 6982 djuinj 6984 exmidomni 7007 ixxdisj 9679 icodisj 9768 ioodisj 9769 uzdisj 9866 nn0disj 9908 fsum2dlemstep 11196 ntrcls0 12289 nninfalllemn 13191 |
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