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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 4302 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ∈ V) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2205 Vcvv 2815 {csn 3694 |
| 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 2208 ax-ext 2216 ax-sep 4233 ax-pow 4292 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-v 2817 df-in 3220 df-ss 3227 df-pw 3676 df-sn 3700 |
| This theorem is referenced by: snelpw 4333 rext 4336 sspwb 4337 intid 4345 euabex 4346 mss 4347 exss 4348 opi1 4353 opeqsn 4374 opeqpr 4375 uniop 4377 snnex 4574 op1stb 4604 dtruex 4686 relop 4910 funopg 5391 funopsn 5865 fo1st 6364 fo2nd 6365 mapsn 6938 mapsnconst 6942 mapsncnv 6943 mapsnf1o2 6944 elixpsn 6983 ixpsnf1o 6984 ensn1 7049 mapsnen 7066 dom1o 7082 xpsnen 7085 endisj 7088 xpcomco 7090 xpassen 7094 phplem2 7120 findcard2 7159 findcard2s 7160 ac6sfi 7168 xpfi 7205 mapfi 7227 djuex 7347 0ct 7411 finomni 7444 exmidfodomrlemim 7517 djuassen 7537 cc2lem 7596 nn0ex 9519 xnn0nnen 10823 fxnn0nninf 10825 inftonninf 10828 hashxp 11216 nninfct 12762 fngsum 13651 znval 14910 fnpsr 14941 reldvg 15670 plyval 15723 elply2 15726 plyss 15729 plyco 15750 plycj 15752 |
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