Theorem snnz 3813

Description: The singleton of a set is not empty. It is also inhabited as shown at snm 3814. (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 3811	. 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅)
3	1, 2	ax-mp 5	1 ⊢ {𝐴} ≠ ∅

Syntax hints:   ∈ wcel 2205   ≠ wne 2414  Vcvv 2815  ∅c0 3510  {csn 3691

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 619  ax-in2 620  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-ext 2216

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-ne 2415  df-v 2817  df-dif 3215  df-nul 3511  df-sn 3697

This theorem is referenced by:  0nep0  4280  1n0  6667  ssfii  7263