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Theorem 0vconngr 29140
Description: A graph without vertices is connected. (Contributed by Alexander van der Vekens, 2-Dec-2017.) (Revised by AV, 15-Feb-2021.)
Assertion
Ref Expression
0vconngr ((𝐺 ∈ π‘Š ∧ (Vtxβ€˜πΊ) = βˆ…) β†’ 𝐺 ∈ ConnGraph)

Proof of Theorem 0vconngr
Dummy variables 𝑓 π‘˜ 𝑛 𝑝 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 rzal 4467 . . 3 ((Vtxβ€˜πΊ) = βˆ… β†’ βˆ€π‘˜ ∈ (Vtxβ€˜πΊ)βˆ€π‘› ∈ (Vtxβ€˜πΊ)βˆƒπ‘“βˆƒπ‘ 𝑓(π‘˜(PathsOnβ€˜πΊ)𝑛)𝑝)
21adantl 483 . 2 ((𝐺 ∈ π‘Š ∧ (Vtxβ€˜πΊ) = βˆ…) β†’ βˆ€π‘˜ ∈ (Vtxβ€˜πΊ)βˆ€π‘› ∈ (Vtxβ€˜πΊ)βˆƒπ‘“βˆƒπ‘ 𝑓(π‘˜(PathsOnβ€˜πΊ)𝑛)𝑝)
3 eqid 2737 . . . 4 (Vtxβ€˜πΊ) = (Vtxβ€˜πΊ)
43isconngr 29136 . . 3 (𝐺 ∈ π‘Š β†’ (𝐺 ∈ ConnGraph ↔ βˆ€π‘˜ ∈ (Vtxβ€˜πΊ)βˆ€π‘› ∈ (Vtxβ€˜πΊ)βˆƒπ‘“βˆƒπ‘ 𝑓(π‘˜(PathsOnβ€˜πΊ)𝑛)𝑝))
54adantr 482 . 2 ((𝐺 ∈ π‘Š ∧ (Vtxβ€˜πΊ) = βˆ…) β†’ (𝐺 ∈ ConnGraph ↔ βˆ€π‘˜ ∈ (Vtxβ€˜πΊ)βˆ€π‘› ∈ (Vtxβ€˜πΊ)βˆƒπ‘“βˆƒπ‘ 𝑓(π‘˜(PathsOnβ€˜πΊ)𝑛)𝑝))
62, 5mpbird 257 1 ((𝐺 ∈ π‘Š ∧ (Vtxβ€˜πΊ) = βˆ…) β†’ 𝐺 ∈ ConnGraph)
Colors of variables: wff setvar class
Syntax hints:   β†’ wi 4   ↔ wb 205   ∧ wa 397   = wceq 1542  βˆƒwex 1782   ∈ wcel 2107  βˆ€wral 3065  βˆ…c0 4283   class class class wbr 5106  β€˜cfv 6497  (class class class)co 7358  Vtxcvtx 27950  PathsOncpthson 28665  ConnGraphcconngr 29133
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-ext 2708  ax-nul 5264
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-sb 2069  df-clab 2715  df-cleq 2729  df-clel 2815  df-ne 2945  df-ral 3066  df-rab 3409  df-v 3448  df-sbc 3741  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4284  df-if 4488  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4867  df-br 5107  df-iota 6449  df-fv 6505  df-ov 7361  df-conngr 29134
This theorem is referenced by:  1conngr  29141
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