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Theorem cplgr0v 29786
Description: A null graph (with no vertices) is a complete graph. (Contributed by Alexander van der Vekens, 13-Oct-2017.) (Revised by AV, 1-Nov-2020.)
Hypothesis
Ref Expression
cplgr0v.v 𝑉 = (Vtx‘𝐺)
Assertion
Ref Expression
cplgr0v ((𝐺𝑊𝑉 = ∅) → 𝐺 ∈ ComplGraph)

Proof of Theorem cplgr0v
Dummy variable 𝑣 is distinct from all other variables.
StepHypRef Expression
1 rzal 4455 . . 3 (𝑉 = ∅ → ∀𝑣𝑉 𝑣 ∈ (UnivVtx‘𝐺))
21adantl 486 . 2 ((𝐺𝑊𝑉 = ∅) → ∀𝑣𝑉 𝑣 ∈ (UnivVtx‘𝐺))
3 cplgr0v.v . . . 4 𝑉 = (Vtx‘𝐺)
43iscplgr 29774 . . 3 (𝐺𝑊 → (𝐺 ∈ ComplGraph ↔ ∀𝑣𝑉 𝑣 ∈ (UnivVtx‘𝐺)))
54adantr 485 . 2 ((𝐺𝑊𝑉 = ∅) → (𝐺 ∈ ComplGraph ↔ ∀𝑣𝑉 𝑣 ∈ (UnivVtx‘𝐺)))
62, 5mpbird 260 1 ((𝐺𝑊𝑉 = ∅) → 𝐺 ∈ ComplGraph)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wb 209  wa 400   = wceq 1570  wcel 2143  wral 3079  c0 4286  cfv 6536  Vtxcvtx 29355  UnivVtxcuvtx 29744  ComplGraphccplgr 29768
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-nul 5269  ax-pr 5404
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-mpt 5193  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-iota 6492  df-fun 6538  df-fv 6544  df-ov 7413  df-uvtx 29745  df-cplgr 29770
This theorem is used by:  cusgr0v  29787
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