Theorem s1val 14638

Description: Value of a singleton word. (Contributed by Stefan O'Rear, 15-Aug-2015.) (Revised by Mario Carneiro, 26-Feb-2016.)

Assertion

Ref	Expression
s1val	⊢ (𝐴 ∈ 𝑉 → ⟨“𝐴”⟩ = {⟨0, 𝐴⟩})

Proof of Theorem s1val

Step	Hyp	Ref	Expression
1		df-s1 14636	. 2 ⊢ ⟨“𝐴”⟩ = {⟨0, ( I ‘𝐴)⟩}
2		fvi 6959	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ( I ‘𝐴) = 𝐴)
3	2	opeq2d 4846	. . 3 ⊢ (𝐴 ∈ 𝑉 → ⟨0, ( I ‘𝐴)⟩ = ⟨0, 𝐴⟩)
4	3	sneqd 4602	. 2 ⊢ (𝐴 ∈ 𝑉 → {⟨0, ( I ‘𝐴)⟩} = {⟨0, 𝐴⟩})
5	1, 4	eqtrid 2810	1 ⊢ (𝐴 ∈ 𝑉 → ⟨“𝐴”⟩ = {⟨0, 𝐴⟩})

Syntax hints:   → wi 4   = wceq 1570   ∈ wcel 2143  {csn 4590  ⟨cop 4596   I cid 5557  ‘cfv 6538  0cc0 11101  ⟨“cs1 14635

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-12 2213  ax-ext 2735  ax-sep 5258  ax-pr 5406

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-br 5111  df-opab 5175  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-iota 6494  df-fun 6540  df-fv 6546  df-s1 14636

This theorem is referenced by:  s1rn  14639  s1cl  14642  s1dmALT  14649  s1fv  14650  s111  14655  repsw1  14822  s1co  14872  s2prop  14946  ofs1  15009  gsumws1  18898  uspgr1ewop  29576  usgr2v1e2w  29580  0wlkons1  30450  s1f1  33241  cshw1s2  33258  ofcs1  34912  signstf0  34933