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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 4274 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ∈ V) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2202 Vcvv 2802 {csn 3669 |
| 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 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 |
| This theorem is referenced by: snelpw 4304 rext 4307 sspwb 4308 intid 4316 euabex 4317 mss 4318 exss 4319 opi1 4324 opeqsn 4345 opeqpr 4346 uniop 4348 snnex 4545 op1stb 4575 dtruex 4657 relop 4880 funopg 5360 funopsn 5829 fo1st 6319 fo2nd 6320 mapsn 6858 mapsnconst 6862 mapsncnv 6863 mapsnf1o2 6864 elixpsn 6903 ixpsnf1o 6904 ensn1 6969 mapsnen 6985 dom1o 7001 xpsnen 7004 endisj 7007 xpcomco 7009 xpassen 7013 phplem2 7038 findcard2 7077 findcard2s 7078 ac6sfi 7086 xpfi 7123 djuex 7241 0ct 7305 finomni 7338 exmidfodomrlemim 7411 djuassen 7431 cc2lem 7484 nn0ex 9407 xnn0nnen 10698 fxnn0nninf 10700 inftonninf 10703 hashxp 11089 nninfct 12611 fngsum 13470 znval 14649 fnpsr 14680 reldvg 15402 plyval 15455 elply2 15458 plyss 15461 plyco 15482 plycj 15484 |
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