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Trees are planar

Lax68.TreePlanar · concepts/Lax68/TreePlanar.lean · lax-68

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    Natural Language Statement

    Theorem

    Every finite tree is planar.

    Concept map
    5 concepts
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    Proven claimDefinitionThis conceptRelated conceptA → B: B builds on A
    Evidence

    Each proof establishes this claim relative to its assumptions.

    Lean source view on GitHub

    1import Lax68.Trees
    2import Lax68.Planar
    3
    4/-!
    5---
    6title: Trees are planar
    7type: theorem
    8---
    9Every finite tree is planar.
    10-/
    11
    12set_option autoImplicit false
    13
    14namespace Lax68.TreePlanar
    15
    16/-- Every finite tree is planar. -/
    17axiom tree_planar {V : Type*} [Finite V] {G : SimpleGraph V} :
    18 Lax68.Trees.IsTree G →
    19 Lax68.Planar.IsPlanar G
    20
    21end Lax68.TreePlanar
    22
    Show Proof
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