Theorem s1val 14534

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 14532	. 2 ⊢ ⟨“𝐴”⟩ = {⟨0, ( I ‘𝐴)⟩}
2		fvi 6918	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ( I ‘𝐴) = 𝐴)
3	2	opeq2d 4838	. . 3 ⊢ (𝐴 ∈ 𝑉 → ⟨0, ( I ‘𝐴)⟩ = ⟨0, 𝐴⟩)
4	3	sneqd 4594	. 2 ⊢ (𝐴 ∈ 𝑉 → {⟨0, ( I ‘𝐴)⟩} = {⟨0, 𝐴⟩})
5	1, 4	eqtrid 2784	1 ⊢ (𝐴 ∈ 𝑉 → ⟨“𝐴”⟩ = {⟨0, 𝐴⟩})

Syntax hints:   → wi 4   = wceq 1542   ∈ wcel 2114  {csn 4582  ⟨cop 4588   I cid 5526  ‘cfv 6500  0cc0 11038  ⟨“cs1 14531

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-12 2185  ax-ext 2709  ax-sep 5243  ax-pr 5379

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-iota 6456  df-fun 6502  df-fv 6508  df-s1 14532

This theorem is referenced by:  s1rn  14535  s1cl  14538  s1dmALT  14545  s1fv  14546  s111  14551  repsw1  14718  s1co  14768  s2prop  14842  ofs1  14905  gsumws1  18775  uspgr1ewop  29333  usgr2v1e2w  29337  0wlkons1  30208  s1f1  33035  cshw1s2  33052  ofcs1  34721  signstf0  34745