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Mirrors > Home > MPE Home > Th. List > 0conngra | Structured version Visualization version GIF version |
Description: A class/graph without vertices is connected. (Contributed by Alexander van der Vekens, 2-Dec-2017.) |
Ref | Expression |
---|---|
0conngra | ⊢ (𝐸 ∈ 𝑉 → ∅ ConnGrph 𝐸) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0ex 4718 | . 2 ⊢ ∅ ∈ V | |
2 | ral0 4028 | . . 3 ⊢ ∀𝑘 ∈ ∅ ∀𝑛 ∈ ∅ ∃𝑓∃𝑝 𝑓(𝑘(∅ PathOn 𝐸)𝑛)𝑝 | |
3 | isconngra 26200 | . . 3 ⊢ ((∅ ∈ V ∧ 𝐸 ∈ 𝑉) → (∅ ConnGrph 𝐸 ↔ ∀𝑘 ∈ ∅ ∀𝑛 ∈ ∅ ∃𝑓∃𝑝 𝑓(𝑘(∅ PathOn 𝐸)𝑛)𝑝)) | |
4 | 2, 3 | mpbiri 247 | . 2 ⊢ ((∅ ∈ V ∧ 𝐸 ∈ 𝑉) → ∅ ConnGrph 𝐸) |
5 | 1, 4 | mpan 702 | 1 ⊢ (𝐸 ∈ 𝑉 → ∅ ConnGrph 𝐸) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 ∃wex 1695 ∈ wcel 1977 ∀wral 2896 Vcvv 3173 ∅c0 3874 class class class wbr 4583 (class class class)co 6549 PathOn cpthon 26032 ConnGrph cconngra 26197 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-iota 5768 df-fv 5812 df-ov 6552 df-conngra 26198 |
This theorem is referenced by: 1conngra 26203 |
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