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Theorem vtxval3sn 26755
Description: Degenerated case 3 for vertices: The set of vertices of a singleton containing a singleton containing a singleton is the innermost singleton. (Contributed by AV, 24-Sep-2020.) (Avoid depending on this detail.)
Hypothesis
Ref Expression
vtxval3sn.a 𝐴 ∈ V
Assertion
Ref Expression
vtxval3sn (Vtx‘{{{𝐴}}}) = {𝐴}

Proof of Theorem vtxval3sn
StepHypRef Expression
1 vtxval3sn.a . 2 𝐴 ∈ V
21opid 4815 . . . 4 𝐴, 𝐴⟩ = {{𝐴}}
32eqcomi 2827 . . 3 {{𝐴}} = ⟨𝐴, 𝐴
43sneqi 4568 . 2 {{{𝐴}}} = {⟨𝐴, 𝐴⟩}
51, 4vtxvalsnop 26753 1 (Vtx‘{{{𝐴}}}) = {𝐴}
Colors of variables: wff setvar class
Syntax hints:   = wceq 1528  wcel 2105  Vcvv 3492  {csn 4557  cop 4563  cfv 6348  Vtxcvtx 26708
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2151  ax-12 2167  ax-ext 2790  ax-sep 5194  ax-nul 5201  ax-pow 5257  ax-pr 5320  ax-un 7450
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 842  df-3an 1081  df-tru 1531  df-ex 1772  df-nf 1776  df-sb 2061  df-mo 2615  df-eu 2647  df-clab 2797  df-cleq 2811  df-clel 2890  df-nfc 2960  df-ne 3014  df-ral 3140  df-rex 3141  df-rab 3144  df-v 3494  df-sbc 3770  df-dif 3936  df-un 3938  df-in 3940  df-ss 3949  df-nul 4289  df-if 4464  df-sn 4558  df-pr 4560  df-op 4564  df-uni 4831  df-br 5058  df-opab 5120  df-mpt 5138  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-iota 6307  df-fun 6350  df-fv 6356  df-1st 7678  df-vtx 26710
This theorem is referenced by: (None)
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