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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 6563 | . . 3 ⊢ ∅:∅⟶∅ | |
2 | dm0 5793 | . . . 4 ⊢ dom ∅ = ∅ | |
3 | pw0 4748 | . . . . . 6 ⊢ 𝒫 ∅ = {∅} | |
4 | 3 | difeq1i 4098 | . . . . 5 ⊢ (𝒫 ∅ ∖ {∅}) = ({∅} ∖ {∅}) |
5 | difid 4333 | . . . . 5 ⊢ ({∅} ∖ {∅}) = ∅ | |
6 | 4, 5 | eqtri 2847 | . . . 4 ⊢ (𝒫 ∅ ∖ {∅}) = ∅ |
7 | 2, 6 | feq23i 6511 | . . 3 ⊢ (∅:dom ∅⟶(𝒫 ∅ ∖ {∅}) ↔ ∅:∅⟶∅) |
8 | 1, 7 | mpbir 233 | . 2 ⊢ ∅:dom ∅⟶(𝒫 ∅ ∖ {∅}) |
9 | 0ex 5214 | . . 3 ⊢ ∅ ∈ V | |
10 | vtxval0 26827 | . . . . 5 ⊢ (Vtx‘∅) = ∅ | |
11 | 10 | eqcomi 2833 | . . . 4 ⊢ ∅ = (Vtx‘∅) |
12 | iedgval0 26828 | . . . . 5 ⊢ (iEdg‘∅) = ∅ | |
13 | 12 | eqcomi 2833 | . . . 4 ⊢ ∅ = (iEdg‘∅) |
14 | 11, 13 | isuhgr 26848 | . . 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 3497 ∖ cdif 3936 ∅c0 4294 𝒫 cpw 4542 {csn 4570 dom cdm 5558 ⟶wf 6354 ‘cfv 6358 Vtxcvtx 26784 iEdgciedg 26785 UHGraphcuhgr 26844 |
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 2796 ax-sep 5206 ax-nul 5213 ax-pow 5269 ax-pr 5333 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-mo 2621 df-eu 2653 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-ne 3020 df-ral 3146 df-rex 3147 df-rab 3150 df-v 3499 df-sbc 3776 df-dif 3942 df-un 3944 df-in 3946 df-ss 3955 df-nul 4295 df-if 4471 df-pw 4544 df-sn 4571 df-pr 4573 df-op 4577 df-uni 4842 df-br 5070 df-opab 5132 df-mpt 5150 df-id 5463 df-xp 5564 df-rel 5565 df-cnv 5566 df-co 5567 df-dm 5568 df-rn 5569 df-iota 6317 df-fun 6360 df-fn 6361 df-f 6362 df-fv 6366 df-slot 16490 df-base 16492 df-edgf 26778 df-vtx 26786 df-iedg 26787 df-uhgr 26846 |
This theorem is referenced by: (None) |
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