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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 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ss0b 3407 |
. 2
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2 | 1 | biimpi 119 |
1
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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 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-dif 3078 df-in 3082 df-ss 3089 df-nul 3369 |
This theorem is referenced by: sseq0 3409 abf 3411 eq0rdv 3412 ssdisj 3424 0dif 3439 poirr2 4939 iotanul 5111 f00 5322 map0b 6589 phplem2 6755 php5dom 6765 sbthlem7 6859 fi0 6871 casefun 6978 caseinj 6982 djufun 6997 djuinj 6999 exmidomni 7022 ixxdisj 9716 icodisj 9805 ioodisj 9806 uzdisj 9904 nn0disj 9946 fsum2dlemstep 11235 ntrcls0 12339 nninfalllemn 13377 |
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