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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 4268 | . 2 ⊢ (𝐴 ∈ V → {𝐴} ∈ V) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ {𝐴} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 Vcvv 2799 {csn 3666 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-v 2801 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 |
| This theorem is referenced by: snelpw 4298 rext 4301 sspwb 4302 intid 4310 euabex 4311 mss 4312 exss 4313 opi1 4318 opeqsn 4339 opeqpr 4340 uniop 4342 snnex 4539 op1stb 4569 dtruex 4651 relop 4872 funopg 5352 funopsn 5819 fo1st 6309 fo2nd 6310 mapsn 6845 mapsnconst 6849 mapsncnv 6850 mapsnf1o2 6851 elixpsn 6890 ixpsnf1o 6891 ensn1 6956 mapsnen 6972 dom1o 6985 xpsnen 6988 endisj 6991 xpcomco 6993 xpassen 6997 phplem2 7022 findcard2 7059 findcard2s 7060 ac6sfi 7068 xpfi 7105 djuex 7221 0ct 7285 finomni 7318 exmidfodomrlemim 7390 djuassen 7410 cc2lem 7463 nn0ex 9386 xnn0nnen 10671 fxnn0nninf 10673 inftonninf 10676 hashxp 11061 nninfct 12577 fngsum 13436 znval 14615 fnpsr 14646 reldvg 15368 plyval 15421 elply2 15424 plyss 15427 plyco 15448 plycj 15450 |
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