Theorem snnz 3765

Description: The singleton of a set is not empty. It is also inhabited as shown at snm 3766. (Contributed by NM, 10-Apr-1994.)

Hypothesis

Ref	Expression
snnz.1	⊢ 𝐴 ∈ V

Assertion

Ref	Expression
snnz	⊢ {𝐴} ≠ ∅

Proof of Theorem snnz

Step	Hyp	Ref	Expression
1		snnz.1	. 2 ⊢ 𝐴 ∈ V
2		snnzg 3763	. 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅)
3	1, 2	ax-mp 5	1 ⊢ {𝐴} ≠ ∅

Syntax hints:   ∈ wcel 2180   ≠ wne 2380  Vcvv 2779  ∅c0 3471  {csn 3646

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-in1 617  ax-in2 618  ax-io 713  ax-5 1473  ax-7 1474  ax-gen 1475  ax-ie1 1519  ax-ie2 1520  ax-8 1530  ax-10 1531  ax-11 1532  ax-i12 1533  ax-bndl 1535  ax-4 1536  ax-17 1552  ax-i9 1556  ax-ial 1560  ax-i5r 1561  ax-ext 2191

This theorem depends on definitions:  df-bi 117  df-tru 1378  df-nf 1487  df-sb 1789  df-clab 2196  df-cleq 2202  df-clel 2205  df-nfc 2341  df-ne 2381  df-v 2781  df-dif 3179  df-nul 3472  df-sn 3652

This theorem is referenced by:  0nep0  4228  1n0  6548  ssfii  7109