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Mirrors > Home > MPE Home > Th. List > vtxval0 | Structured version Visualization version GIF version |
Description: Degenerated case 1 for vertices: The set of vertices of the empty set is the empty set. (Contributed by AV, 24-Sep-2020.) |
Ref | Expression |
---|---|
vtxval0 | ⊢ (Vtx‘∅) = ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0nelxp 5553 | . . 3 ⊢ ¬ ∅ ∈ (V × V) | |
2 | 1 | iffalsei 4435 | . 2 ⊢ if(∅ ∈ (V × V), (1st ‘∅), (Base‘∅)) = (Base‘∅) |
3 | vtxval 26793 | . 2 ⊢ (Vtx‘∅) = if(∅ ∈ (V × V), (1st ‘∅), (Base‘∅)) | |
4 | base0 16528 | . 2 ⊢ ∅ = (Base‘∅) | |
5 | 2, 3, 4 | 3eqtr4i 2831 | 1 ⊢ (Vtx‘∅) = ∅ |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1538 ∈ wcel 2111 Vcvv 3441 ∅c0 4243 ifcif 4425 × cxp 5517 ‘cfv 6324 1st c1st 7669 Basecbs 16475 Vtxcvtx 26789 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 ax-pr 5295 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-3an 1086 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-mo 2598 df-eu 2629 df-clab 2777 df-cleq 2791 df-clel 2870 df-nfc 2938 df-ne 2988 df-ral 3111 df-rex 3112 df-rab 3115 df-v 3443 df-sbc 3721 df-dif 3884 df-un 3886 df-in 3888 df-ss 3898 df-nul 4244 df-if 4426 df-sn 4526 df-pr 4528 df-op 4532 df-uni 4801 df-br 5031 df-opab 5093 df-mpt 5111 df-id 5425 df-xp 5525 df-rel 5526 df-cnv 5527 df-co 5528 df-dm 5529 df-iota 6283 df-fun 6326 df-fv 6332 df-slot 16479 df-base 16481 df-vtx 26791 |
This theorem is referenced by: uhgr0 26866 usgr0 27033 0grsubgr 27068 cplgr0 27215 vtxdg0v 27263 0grrusgr 27369 0wlk0 27442 0conngr 27977 frgr0 28050 |
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