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| Mirrors > Home > ILE Home > Th. List > snex | GIF version | ||
| Description: A singleton whose element exists is a set. (Contributed by NM, 7-Aug-1994.) (Revised by Mario Carneiro, 24-May-2019.) |
| Ref | Expression |
|---|---|
| snex.1 | ⊢ 𝐴 ∈ V |
| Ref | Expression |
|---|---|
| snex | ⊢ {𝐴} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snex.1 | . 2 ⊢ 𝐴 ∈ V | |
| 2 | snexg 4316 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ∈ V) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2209 Vcvv 2821 {csn 3705 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4244 ax-pow 4306 |
| This theorem depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-in 3226 df-ss 3233 df-pw 3687 df-sn 3711 |
| This theorem is referenced by: snelpw 4347 rext 4350 sspwb 4351 intid 4359 euabex 4360 mss 4361 exss 4362 opi1 4367 opeqsn 4388 opeqpr 4389 uniop 4391 snnex 4589 op1stb 4619 dtruex 4701 relop 4925 funopg 5406 funopsn 5882 fo1st 6381 fo2nd 6382 mapsn 6962 mapsnconst 6966 mapsncnv 6967 mapsnf1o2 6968 elixpsn 7007 ixpsnf1o 7008 ensn1 7073 mapsnen 7090 dom1o 7106 xpsnen 7109 endisj 7112 xpcomco 7114 xpassen 7118 phplem2 7144 findcard2 7183 findcard2s 7184 ac6sfi 7192 xpfi 7229 mapfi 7251 djuex 7373 0ct 7437 finomni 7470 exmidfodomrlemim 7543 djuassen 7563 cc2lem 7622 nn0ex 9548 xnn0nnen 10852 fxnn0nninf 10854 inftonninf 10857 hashxp 11245 hashf1lem1 11263 nninfct 12796 fngzsum 13685 znval 14943 fnpsr 14974 reldvg 15703 plyval 15756 elply2 15759 plyss 15762 plyco 15783 plycj 15785 |
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