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Mirrors > Home > MPE Home > Th. List > uhgr0 | Structured version Visualization version GIF version |
Description: The null graph represented by an empty set is a hypergraph. (Contributed by AV, 9-Oct-2020.) |
Ref | Expression |
---|---|
uhgr0 | ⊢ ∅ ∈ UHGraph |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | f0 6534 | . . 3 ⊢ ∅:∅⟶∅ | |
2 | dm0 5754 | . . . 4 ⊢ dom ∅ = ∅ | |
3 | pw0 4705 | . . . . . 6 ⊢ 𝒫 ∅ = {∅} | |
4 | 3 | difeq1i 4046 | . . . . 5 ⊢ (𝒫 ∅ ∖ {∅}) = ({∅} ∖ {∅}) |
5 | difid 4284 | . . . . 5 ⊢ ({∅} ∖ {∅}) = ∅ | |
6 | 4, 5 | eqtri 2821 | . . . 4 ⊢ (𝒫 ∅ ∖ {∅}) = ∅ |
7 | 2, 6 | feq23i 6481 | . . 3 ⊢ (∅:dom ∅⟶(𝒫 ∅ ∖ {∅}) ↔ ∅:∅⟶∅) |
8 | 1, 7 | mpbir 234 | . 2 ⊢ ∅:dom ∅⟶(𝒫 ∅ ∖ {∅}) |
9 | 0ex 5175 | . . 3 ⊢ ∅ ∈ V | |
10 | vtxval0 26832 | . . . . 5 ⊢ (Vtx‘∅) = ∅ | |
11 | 10 | eqcomi 2807 | . . . 4 ⊢ ∅ = (Vtx‘∅) |
12 | iedgval0 26833 | . . . . 5 ⊢ (iEdg‘∅) = ∅ | |
13 | 12 | eqcomi 2807 | . . . 4 ⊢ ∅ = (iEdg‘∅) |
14 | 11, 13 | isuhgr 26853 | . . 3 ⊢ (∅ ∈ V → (∅ ∈ UHGraph ↔ ∅:dom ∅⟶(𝒫 ∅ ∖ {∅}))) |
15 | 9, 14 | ax-mp 5 | . 2 ⊢ (∅ ∈ UHGraph ↔ ∅:dom ∅⟶(𝒫 ∅ ∖ {∅})) |
16 | 8, 15 | mpbir 234 | 1 ⊢ ∅ ∈ UHGraph |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 ∈ wcel 2111 Vcvv 3441 ∖ cdif 3878 ∅c0 4243 𝒫 cpw 4497 {csn 4525 dom cdm 5519 ⟶wf 6320 ‘cfv 6324 Vtxcvtx 26789 iEdgciedg 26790 UHGraphcuhgr 26849 |
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-pw 4499 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-rn 5530 df-iota 6283 df-fun 6326 df-fn 6327 df-f 6328 df-fv 6332 df-slot 16479 df-base 16481 df-edgf 26783 df-vtx 26791 df-iedg 26792 df-uhgr 26851 |
This theorem is referenced by: (None) |
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