Theorem snnzg 3760

Description: The singleton of a set is not empty. It is also inhabited as shown at snmg 3761. (Contributed by NM, 14-Dec-2008.)

Assertion

Ref	Expression
snnzg	⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅)

Proof of Theorem snnzg

Step	Hyp	Ref	Expression
1		snidg 3672	. 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ {𝐴})
2		ne0i 3475	. 2 ⊢ (𝐴 ∈ {𝐴} → {𝐴} ≠ ∅)
3	1, 2	syl 14	1 ⊢ (𝐴 ∈ 𝑉 → {𝐴} ≠ ∅)

Syntax hints:   → wi 4   ∈ wcel 2178   ≠ wne 2378  ∅c0 3468  {csn 3643

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 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-ext 2189

This theorem depends on definitions:  df-bi 117  df-tru 1376  df-nf 1485  df-sb 1787  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-v 2778  df-dif 3176  df-nul 3469  df-sn 3649

This theorem is referenced by:  snnz  3762  0nelop  4310