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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 6553 | . . 3 ⊢ ∅:∅⟶∅ | |
2 | dm0 5783 | . . . 4 ⊢ dom ∅ = ∅ | |
3 | pw0 4738 | . . . . . 6 ⊢ 𝒫 ∅ = {∅} | |
4 | 3 | difeq1i 4088 | . . . . 5 ⊢ (𝒫 ∅ ∖ {∅}) = ({∅} ∖ {∅}) |
5 | difid 4323 | . . . . 5 ⊢ ({∅} ∖ {∅}) = ∅ | |
6 | 4, 5 | eqtri 2843 | . . . 4 ⊢ (𝒫 ∅ ∖ {∅}) = ∅ |
7 | 2, 6 | feq23i 6501 | . . 3 ⊢ (∅:dom ∅⟶(𝒫 ∅ ∖ {∅}) ↔ ∅:∅⟶∅) |
8 | 1, 7 | mpbir 233 | . 2 ⊢ ∅:dom ∅⟶(𝒫 ∅ ∖ {∅}) |
9 | 0ex 5204 | . . 3 ⊢ ∅ ∈ V | |
10 | vtxval0 26820 | . . . . 5 ⊢ (Vtx‘∅) = ∅ | |
11 | 10 | eqcomi 2829 | . . . 4 ⊢ ∅ = (Vtx‘∅) |
12 | iedgval0 26821 | . . . . 5 ⊢ (iEdg‘∅) = ∅ | |
13 | 12 | eqcomi 2829 | . . . 4 ⊢ ∅ = (iEdg‘∅) |
14 | 11, 13 | isuhgr 26841 | . . 3 ⊢ (∅ ∈ V → (∅ ∈ UHGraph ↔ ∅:dom ∅⟶(𝒫 ∅ ∖ {∅}))) |
15 | 9, 14 | ax-mp 5 | . 2 ⊢ (∅ ∈ UHGraph ↔ ∅:dom ∅⟶(𝒫 ∅ ∖ {∅})) |
16 | 8, 15 | mpbir 233 | 1 ⊢ ∅ ∈ UHGraph |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∈ wcel 2113 Vcvv 3491 ∖ cdif 3926 ∅c0 4284 𝒫 cpw 4532 {csn 4560 dom cdm 5548 ⟶wf 6344 ‘cfv 6348 Vtxcvtx 26777 iEdgciedg 26778 UHGraphcuhgr 26837 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2792 ax-sep 5196 ax-nul 5203 ax-pow 5259 ax-pr 5323 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1084 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2799 df-cleq 2813 df-clel 2892 df-nfc 2962 df-ne 3016 df-ral 3142 df-rex 3143 df-rab 3146 df-v 3493 df-sbc 3769 df-dif 3932 df-un 3934 df-in 3936 df-ss 3945 df-nul 4285 df-if 4461 df-pw 4534 df-sn 4561 df-pr 4563 df-op 4567 df-uni 4832 df-br 5060 df-opab 5122 df-mpt 5140 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-fn 6351 df-f 6352 df-fv 6356 df-slot 16480 df-base 16482 df-edgf 26771 df-vtx 26779 df-iedg 26780 df-uhgr 26839 |
This theorem is referenced by: (None) |
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