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Mirrors > Home > MPE Home > Th. List > ss0 | Structured version Visualization version GIF 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 | ⊢ (𝐴 ⊆ ∅ → 𝐴 = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ss0b 4351 | . 2 ⊢ (𝐴 ⊆ ∅ ↔ 𝐴 = ∅) | |
2 | 1 | biimpi 218 | 1 ⊢ (𝐴 ⊆ ∅ → 𝐴 = ∅) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1537 ⊆ wss 3936 ∅c0 4291 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-dif 3939 df-in 3943 df-ss 3952 df-nul 4292 |
This theorem is referenced by: sseq0 4353 0dif 4355 eq0rdv 4357 ssdisj 4409 disjpss 4410 dfopif 4800 iunxdif3 5017 fr0 5534 poirr2 5984 sofld 6044 f00 6561 tfindsg 7575 findsg 7609 frxp 7820 map0b 8447 sbthlem7 8633 phplem2 8697 fi0 8884 cantnflem1 9152 rankeq0b 9289 grur1a 10241 ixxdisj 12754 icodisj 12863 ioodisj 12869 uzdisj 12981 nn0disj 13024 hashf1lem2 13815 swrd0 14020 xptrrel 14340 sumz 15079 sumss 15081 fsum2dlem 15125 prod1 15298 prodss 15301 fprodss 15302 fprod2dlem 15334 cntzval 18451 oppglsm 18767 efgval 18843 islss 19706 00lss 19713 mplsubglem 20214 ntrcls0 21684 neindisj2 21731 hauscmplem 22014 fbdmn0 22442 fbncp 22447 opnfbas 22450 fbasfip 22476 fbunfip 22477 fgcl 22486 supfil 22503 ufinffr 22537 alexsubALTlem2 22656 metnrmlem3 23469 itg1addlem4 24300 uc1pval 24733 mon1pval 24735 pserulm 25010 vtxdun 27263 vtxdginducedm1 27325 difres 30350 imadifxp 30351 swrdrndisj 30631 cycpmco2f1 30766 esumrnmpt2 31327 truae 31502 carsgclctunlem2 31577 acycgr0v 32395 prclisacycgr 32398 derangsn 32417 poimirlem3 34910 ismblfin 34948 pcl0N 37073 pcl0bN 37074 coeq0i 39370 eldioph2lem2 39378 eldioph4b 39428 ntrk2imkb 40407 ntrk0kbimka 40409 ssin0 41337 iccdifprioo 41812 sumnnodd 41931 sge0split 42711 0setrec 44826 |
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