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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 4297 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ∈ V) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2203 Vcvv 2813 {csn 3689 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2206 ax-ext 2214 ax-sep 4228 ax-pow 4287 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-v 2815 df-in 3217 df-ss 3224 df-pw 3671 df-sn 3695 |
| This theorem is referenced by: snelpw 4328 rext 4331 sspwb 4332 intid 4340 euabex 4341 mss 4342 exss 4343 opi1 4348 opeqsn 4369 opeqpr 4370 uniop 4372 snnex 4569 op1stb 4599 dtruex 4681 relop 4905 funopg 5386 funopsn 5860 fo1st 6351 fo2nd 6352 mapsn 6925 mapsnconst 6929 mapsncnv 6930 mapsnf1o2 6931 elixpsn 6970 ixpsnf1o 6971 ensn1 7036 mapsnen 7053 dom1o 7069 xpsnen 7072 endisj 7075 xpcomco 7077 xpassen 7081 phplem2 7107 findcard2 7146 findcard2s 7147 ac6sfi 7155 xpfi 7192 mapfi 7214 djuex 7334 0ct 7398 finomni 7431 exmidfodomrlemim 7504 djuassen 7524 cc2lem 7580 nn0ex 9502 xnn0nnen 10799 fxnn0nninf 10801 inftonninf 10804 hashxp 11191 nninfct 12737 fngsum 13601 znval 14784 fnpsr 14815 reldvg 15544 plyval 15597 elply2 15600 plyss 15603 plyco 15624 plycj 15626 |
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