Theorem snex 3889

Description: A singleton whose element exists is a set. (Contributed by NM, 7-Aug-1994.) (Revised by Mario Carneiro, 24-May-2019.)

Hypothesis

Ref	Expression
snex.1	⊢ A ∈ V

Assertion

Ref	Expression
snex	⊢ {A} ∈ V

Proof of Theorem snex

Step	Hyp	Ref	Expression
1		snex.1	. 2 ⊢ A ∈ V
2		snexg 3888	. 2 ⊢ (A ∈ V → {A} ∈ V)
3	1, 2	ax-mp 7	1 ⊢ {A} ∈ V

Syntax hints:   ∈ wcel 1375  Vcvv 2533  {csn 3327

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 617  ax-5 1315  ax-7 1316  ax-gen 1317  ax-ie1 1362  ax-ie2 1363  ax-8 1377  ax-10 1378  ax-11 1379  ax-i12 1380  ax-bnd 1381  ax-4 1382  ax-14 1387  ax-17 1401  ax-i9 1405  ax-ial 1410  ax-i5r 1411  ax-ext 2004  ax-sep 3827  ax-pow 3879

This theorem depends on definitions:  df-bi 110  df-tru 1231  df-nf 1329  df-sb 1628  df-clab 2009  df-cleq 2015  df-clel 2018  df-nfc 2149  df-v 2535  df-in 2902  df-ss 2909  df-pw 3313  df-sn 3333

This theorem is referenced by: (None)