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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 5830 fo1st 6320 fo2nd 6321 mapsn 6859 mapsnconst 6863 mapsncnv 6864 mapsnf1o2 6865 elixpsn 6904 ixpsnf1o 6905 ensn1 6970 mapsnen 6986 dom1o 7002 xpsnen 7005 endisj 7008 xpcomco 7010 xpassen 7014 phplem2 7039 findcard2 7078 findcard2s 7079 ac6sfi 7087 xpfi 7124 djuex 7242 0ct 7306 finomni 7339 exmidfodomrlemim 7412 djuassen 7432 cc2lem 7485 nn0ex 9408 xnn0nnen 10700 fxnn0nninf 10702 inftonninf 10705 hashxp 11091 nninfct 12617 fngsum 13476 znval 14656 fnpsr 14687 reldvg 15409 plyval 15462 elply2 15465 plyss 15468 plyco 15489 plycj 15491 |
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