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Theorem s1prc 11311
Description: Value of a singleton word if the symbol is a proper class. (Contributed by AV, 26-Mar-2022.)
Assertion
Ref Expression
s1prc 𝐴 ∈ V → ⟨“𝐴”⟩ = ⟨“∅”⟩)

Proof of Theorem s1prc
StepHypRef Expression
1 fvprc 5664 . . . 4 𝐴 ∈ V → ( I ‘𝐴) = ∅)
21opeq2d 3890 . . 3 𝐴 ∈ V → ⟨0, ( I ‘𝐴)⟩ = ⟨0, ∅⟩)
32sneqd 3702 . 2 𝐴 ∈ V → {⟨0, ( I ‘𝐴)⟩} = {⟨0, ∅⟩})
4 df-s1 11304 . 2 ⟨“𝐴”⟩ = {⟨0, ( I ‘𝐴)⟩}
5 0ex 4237 . . 3 ∅ ∈ V
6 s1val 11305 . . 3 (∅ ∈ V → ⟨“∅”⟩ = {⟨0, ∅⟩})
75, 6ax-mp 5 . 2 ⟨“∅”⟩ = {⟨0, ∅⟩}
83, 4, 73eqtr4g 2290 1 𝐴 ∈ V → ⟨“𝐴”⟩ = ⟨“∅”⟩)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1398  wcel 2203  Vcvv 2813  c0 3508  {csn 3689  cop 3692   I cid 4409  cfv 5352  0cc0 8127  ⟨“cs1 11303
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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-nul 4236  ax-pow 4287  ax-pr 4322  ax-setind 4659
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-ral 2525  df-rex 2526  df-v 2815  df-sbc 3043  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-iota 5312  df-fun 5354  df-fv 5360  df-s1 11304
This theorem is referenced by: (None)
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