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Mirrors > Home > MPE Home > Th. List > vtxval3sn | Structured version Visualization version GIF version |
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.) |
Ref | Expression |
---|---|
vtxval3sn.a | ⊢ 𝐴 ∈ V |
Ref | Expression |
---|---|
vtxval3sn | ⊢ (Vtx‘{{{𝐴}}}) = {𝐴} |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vtxval3sn.a | . 2 ⊢ 𝐴 ∈ V | |
2 | 1 | opid 4815 | . . . 4 ⊢ 〈𝐴, 𝐴〉 = {{𝐴}} |
3 | 2 | eqcomi 2827 | . . 3 ⊢ {{𝐴}} = 〈𝐴, 𝐴〉 |
4 | 3 | sneqi 4568 | . 2 ⊢ {{{𝐴}}} = {〈𝐴, 𝐴〉} |
5 | 1, 4 | vtxvalsnop 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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