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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 4280 | . 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 2803 {csn 3673 |
| 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 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 |
| This theorem is referenced by: snelpw 4310 rext 4313 sspwb 4314 intid 4322 euabex 4323 mss 4324 exss 4325 opi1 4330 opeqsn 4351 opeqpr 4352 uniop 4354 snnex 4551 op1stb 4581 dtruex 4663 relop 4886 funopg 5367 funopsn 5838 fo1st 6329 fo2nd 6330 mapsn 6902 mapsnconst 6906 mapsncnv 6907 mapsnf1o2 6908 elixpsn 6947 ixpsnf1o 6948 ensn1 7013 mapsnen 7029 dom1o 7045 xpsnen 7048 endisj 7051 xpcomco 7053 xpassen 7057 phplem2 7082 findcard2 7121 findcard2s 7122 ac6sfi 7130 xpfi 7167 djuex 7285 0ct 7349 finomni 7382 exmidfodomrlemim 7455 djuassen 7475 cc2lem 7528 nn0ex 9450 xnn0nnen 10745 fxnn0nninf 10747 inftonninf 10750 hashxp 11136 nninfct 12675 fngsum 13534 znval 14715 fnpsr 14746 reldvg 15473 plyval 15526 elply2 15529 plyss 15532 plyco 15553 plycj 15555 |
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