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Theorem isfusgr 40537
 Description: The property of being a finite simple graph. (Contributed by AV, 3-Jan-2020.) (Revised by AV, 21-Oct-2020.)
Hypothesis
Ref Expression
isfusgr.v 𝑉 = (Vtx‘𝐺)
Assertion
Ref Expression
isfusgr (𝐺 ∈ FinUSGraph ↔ (𝐺 ∈ USGraph ∧ 𝑉 ∈ Fin))

Proof of Theorem isfusgr
Dummy variable 𝑔 is distinct from all other variables.
StepHypRef Expression
1 fveq2 6103 . . . 4 (𝑔 = 𝐺 → (Vtx‘𝑔) = (Vtx‘𝐺))
2 isfusgr.v . . . 4 𝑉 = (Vtx‘𝐺)
31, 2syl6eqr 2662 . . 3 (𝑔 = 𝐺 → (Vtx‘𝑔) = 𝑉)
43eleq1d 2672 . 2 (𝑔 = 𝐺 → ((Vtx‘𝑔) ∈ Fin ↔ 𝑉 ∈ Fin))
5 df-fusgr 40536 . 2 FinUSGraph = {𝑔 ∈ USGraph ∣ (Vtx‘𝑔) ∈ Fin}
64, 5elrab2 3333 1 (𝐺 ∈ FinUSGraph ↔ (𝐺 ∈ USGraph ∧ 𝑉 ∈ Fin))
 Colors of variables: wff setvar class Syntax hints:   ↔ wb 195   ∧ wa 383   = wceq 1475   ∈ wcel 1977  ‘cfv 5804  Fincfn 7841  Vtxcvtx 25673   USGraph cusgr 40379   FinUSGraph cfusgr 40535 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-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590 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-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  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-iota 5768  df-fv 5812  df-fusgr 40536 This theorem is referenced by:  fusgrvtxfi  40538  isfusgrf1  40539  isfusgrcl  40540  fusgrusgr  40541  opfusgr  40542  fusgredgfi  40544  fusgrfis  40549  nbfusgrlevtxm1  40605  nbfusgrlevtxm2  40606  cusgrsizeindslem  40667  cusgrsizeinds  40668  sizusglecusglem2  40678  fusgrmaxsize  40680  finrusgrfusgr  40765  rusgrnumwwlks  41177  rusgrnumwwlk  41178  frrusgrord0  41503  av-friendshipgt3  41552
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