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| Mirrors > Home > MPE Home > Th. List > usgr0eop | Structured version Visualization version GIF version | ||
| Description: The empty graph, with vertices but no edges, is a simple graph. (Contributed by Alexander van der Vekens, 10-Aug-2017.) (Revised by AV, 16-Oct-2020.) |
| Ref | Expression |
|---|---|
| usgr0eop | ⊢ (𝑉 ∈ 𝑊 → 〈𝑉, ∅〉 ∈ USGraph) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opex 5444 | . . 3 ⊢ 〈𝑉, ∅〉 ∈ V | |
| 2 | 1 | a1i 11 | . 2 ⊢ (𝑉 ∈ 𝑊 → 〈𝑉, ∅〉 ∈ V) |
| 3 | 0ex 5269 | . . 3 ⊢ ∅ ∈ V | |
| 4 | opiedgfv 29368 | . . 3 ⊢ ((𝑉 ∈ 𝑊 ∧ ∅ ∈ V) → (iEdg‘〈𝑉, ∅〉) = ∅) | |
| 5 | 3, 4 | mpan2 703 | . 2 ⊢ (𝑉 ∈ 𝑊 → (iEdg‘〈𝑉, ∅〉) = ∅) |
| 6 | 2, 5 | usgr0e 29597 | 1 ⊢ (𝑉 ∈ 𝑊 → 〈𝑉, ∅〉 ∈ USGraph) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1569 ∈ wcel 2142 Vcvv 3454 ∅c0 4285 〈cop 4594 ‘cfv 6536 iEdgciedg 29358 USGraphcusgr 29510 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1824 ax-4 1838 ax-5 1939 ax-6 1996 ax-7 2037 ax-8 2144 ax-9 2152 ax-10 2175 ax-11 2191 ax-12 2212 ax-ext 2734 ax-sep 5256 ax-nul 5268 ax-pr 5403 ax-un 7734 |
| This proof depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1104 df-tru 1572 df-fal 1582 df-ex 1809 df-nf 1813 df-sb 2096 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-rab 3416 df-v 3456 df-sbc 3744 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4487 df-pw 4563 df-sn 4589 df-pr 4591 df-op 4595 df-uni 4872 df-br 5109 df-opab 5173 df-mpt 5192 df-id 5555 df-xp 5666 df-rel 5667 df-cnv 5668 df-co 5669 df-dm 5670 df-rn 5671 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fv 6544 df-2nd 7985 df-iedg 29360 df-usgr 29512 |
| This theorem is used by: rgrusgrprc 29950 |
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