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Middle of an open chain

Lax771644.OpenMiddle · concepts/Lax771644/OpenMiddle.lean · lax-771644

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    Natural Language Statement

    Theorem

    Proved from OpenRootOpenRoot, which is unproven, so this statement is unproven too although it has a proof. The drawing should show a complete turnstile above an open dock.

    Concept map
    2 concepts
    100%
    Open claimDefinitionThis conceptRelated conceptA → B: B builds on A
    Evidence

    Each proof establishes this claim relative to its assumptions.

    Lean source view on GitHub

    1import Mathlib.Data.Nat.Notation
    2import Lax771644.Foundations
    3
    4/-!
    5---
    6title: Middle of an open chain
    7type: theorem
    8---
    9Proved from `OpenRoot`, which is unproven, so this statement is unproven too
    10although it has a proof. The drawing should show a complete turnstile above an
    11open dock.
    12
    13# Formalization notes
    14
    15Proven *relative to* `OpenRoot.openRung`, in the spec's terminology.
    16-/
    17
    18namespace Lax771644.OpenMiddle
    19
    20/-- Descent from stage 400 to stage 380. -/
    21axiom middleRung : Foundations.Descent 400 380
    22
    23end Lax771644.OpenMiddle
    24
    Show Proof
    Formalization notes

    Proven relative to OpenRoot.openRungOpenRoot.openRung, in the spec's terminology.

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    From Mathlib

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