Theorem sneqd 3411

Description: Equality deduction for singletons. (Contributed by NM, 22-Jan-2004.)

Hypothesis

Ref	Expression
sneqd.1	⊢ (𝜑 → 𝐴 = 𝐵)

Assertion

Ref	Expression
sneqd	⊢ (𝜑 → {𝐴} = {𝐵})

Proof of Theorem sneqd

Step	Hyp	Ref	Expression
1		sneqd.1	. 2 ⊢ (𝜑 → 𝐴 = 𝐵)
2		sneq 3409	. 2 ⊢ (𝐴 = 𝐵 → {𝐴} = {𝐵})
3	1, 2	syl 14	1 ⊢ (𝜑 → {𝐴} = {𝐵})

Syntax hints:   → wi 4   = wceq 1284  {csn 3398

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-11 1437  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063

This theorem depends on definitions:  df-bi 115  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-sn 3404

This theorem is referenced by:  dmsnsnsng  4818  cnvsng  4826  ressn  4878  f1osng  5187  fsng  5357  fnressn  5370  fvsng  5380  2nd1st  5826  dfmpt2  5864  cnvf1olem  5865  tpostpos  5902  tfrlemi1  5969  en1bg  6303  xpassen  6327  fztp  9095  fzsuc2  9096  fseq1p1m1  9111  fseq1m1p1  9112  divalgmod  10327