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Mirrors > Home > ILE Home > Th. List > elsni | GIF version |
Description: There is only one element in a singleton. (Contributed by NM, 5-Jun-1994.) |
Ref | Expression |
---|---|
elsni | ⊢ (𝐴 ∈ {𝐵} → 𝐴 = 𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elsng 3585 | . 2 ⊢ (𝐴 ∈ {𝐵} → (𝐴 ∈ {𝐵} ↔ 𝐴 = 𝐵)) | |
2 | 1 | ibi 175 | 1 ⊢ (𝐴 ∈ {𝐵} → 𝐴 = 𝐵) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1342 ∈ wcel 2135 {csn 3570 |
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-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-v 2723 df-sn 3576 |
This theorem is referenced by: elsn2g 3603 nelsn 3605 disjsn2 3633 sssnm 3728 disjxsn 3974 pwntru 4172 opth1 4208 elsuci 4375 ordtri2orexmid 4494 onsucsssucexmid 4498 sosng 4671 ressn 5138 funcnvsn 5227 funinsn 5231 fvconst 5667 fmptap 5669 fmptapd 5670 fvunsng 5673 mposnif 5927 1stconst 6180 2ndconst 6181 reldmtpos 6212 tpostpos 6223 1domsn 6776 ac6sfi 6855 onunsnss 6873 snon0 6892 snexxph 6906 elfi2 6928 supsnti 6961 djuf1olem 7009 eldju2ndl 7028 eldju2ndr 7029 difinfsnlem 7055 pw1on 7173 elreal2 7762 ax1rid 7809 ltxrlt 7955 un0addcl 9138 un0mulcl 9139 elfzonlteqm1 10135 fxnn0nninf 10363 1exp 10474 hashinfuni 10679 hashennnuni 10681 hashprg 10710 zfz1isolemiso 10738 fisumss 11319 sumsnf 11336 fsumsplitsn 11337 fsum2dlemstep 11361 fisumcom2 11365 fprodssdc 11517 fprodunsn 11531 fprod2dlemstep 11549 fprodcom2fi 11553 fprodsplitsn 11560 divalgmod 11849 phi1 12128 dfphi2 12129 nnnn0modprm0 12164 exmidunben 12296 txdis1cn 12819 bj-nntrans 13668 bj-nnelirr 13670 pwtrufal 13711 sssneq 13716 exmidsbthrlem 13735 |
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