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Lax68.HalinPlanar

Halin graphs are planar

concepts/Lax68/HalinPlanar.lean · lax-68

proven

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    Proven claimDefinitionThis conceptRelated conceptA → B: B builds on A

    Evidence

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    Theorem

    Every Halin graph is planar.

    Lean source view on GitHub

    1import Lax68.HalinGraphs
    2import Lax68.Planar
    3
    4/-!
    5---
    6title: Halin graphs are planar
    7type: theorem
    8---
    9Every Halin graph is planar.
    10-/
    11
    12set_option autoImplicit false
    13
    14namespace Lax68.HalinPlanar
    15
    16axiom halin_planar
    17 {V : Type*} {G : SimpleGraph V} :
    18 Lax68.HalinGraphs.IsHalin G →
    19 Lax68.Planar.IsPlanar G
    20
    21end Lax68.HalinPlanar
    22
    Show Proof

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