| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 219 | 1 ⊢ (𝐴 ⊆ ∅ → 𝐴 = ∅) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ⊆ wss 3899 ∅c0 4279 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2733 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2740 df-cleq 2753 df-clel 2836 df-dif 3902 df-ss 3916 df-nul 4280 |
| This theorem is used by: 0dif 4356 eq0rdvALT 4366 ssdisj 4413 disjpss 4414 dfopif 4830 iunxdif3 5055 fr0 5629 poirr2 6116 sofld 6178 f00 6756 fvmptopab 7467 tfindsg 7861 findsg 7898 frxp 8127 map0b 8895 sbthlem7 9096 ssfi 9172 fi0 9396 cantnflem1 9674 rankeq0b 9857 scott0 9917 grur1a 10885 ixxdisj 13472 icodisj 13588 ioodisj 13594 uzdisj 13711 nn0disj 13758 hashf1lem2 14581 swrd0 14788 xptrrel 15113 sumz 15868 sumss 15870 fsum2dlem 15916 prod1 16091 prodss 16094 fprodss 16095 fprod2dlem 16127 cntzval 19515 oppglsm 19836 efgval 19911 islss 21189 00lss 21196 ssdifidllem 21620 mplsubglem 22286 ntrcls0 23374 neindisj2 23421 hauscmplem 23704 fbdmn0 24133 fbncp 24138 opnfbas 24141 fbasfip 24167 fbunfip 24168 fgcl 24177 supfil 24194 ufinffr 24228 alexsubALTlem2 24347 metnrmlem3 25161 itg1addlem4 26000 uc1pval 26438 mon1pval 26440 pserulm 26731 vtxdun 30044 vtxdginducedm1 30106 difres 33176 imadifxp 33177 swrdrndisj 33500 cycpmco2f1 33667 erlval 33801 ply1dg3rt0irred 34098 esumrnmpt2 34682 truae 34858 carsgclctunlem2 34934 acycgr0v 35882 prclisacycgr 35885 derangsn 35904 ttc00 37266 poimirlem3 38509 ismblfin 38547 pcl0N 40947 pcl0bN 40948 coeq0i 43717 eldioph2lem2 43725 eldioph4b 43771 oe0suclim 44237 ntrk2imkb 44996 ntrk0kbimka 44998 ssin0 46015 iccdifprioo 46472 sumnnodd 46586 sge0split 47363 iscnrm3llem2 50002 0setrec 50741 |
| Copyright terms: Public domain | W3C validator |