Theorem snnz 3830

Description: The singleton of a set is not empty. It is also inhabited as shown at snm 3831. (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 3828	. 2 ⊢ (𝐴 ∈ V → {𝐴} ≠ ∅)
3	1, 2	ax-mp 5	1 ⊢ {𝐴} ≠ ∅

Syntax hints:   ∈ wcel 2209   ≠ wne 2420  Vcvv 2821  ∅c0 3520  {csn 3708

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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220

This theorem depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-v 2823  df-dif 3222  df-nul 3521  df-sn 3714

This theorem is referenced by:  0nep0  4300  1n0  6699  ssfii  7302