Interactive Theorem Proving SoSe 2026
  • Index
  • Lectures
    • Setup
    • Intro
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    • Decidable
    • Logic
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    • Relation
    • SKI
    • SKIx
    • Partial
    • Coinduction
    • Undecidable
  • Exercises
    • Sheet 01
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    • Sheet 03
    • Sheet 04
    • Sheet 05
    • Sheet 06
    • Sheet 07
    • Sheet 08
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------------------------------------------------------------------------
-- The Agda standard library
--
-- Results concerning the excluded middle axiom.
------------------------------------------------------------------------

{-# OPTIONS --cubical-compatible --safe #-}

module Axiom.ExcludedMiddle where

open import Level using (Level; suc)
open import Relation.Nullary.Decidable.Core using (Dec)

------------------------------------------------------------------------
-- Definition

-- The classical statement of excluded middle says that every
-- statement/set is decidable (i.e. it either holds or it doesn't hold).

ExcludedMiddle : ∀ ℓ → Set (suc ℓ)
ExcludedMiddle ℓ = {P : Set ℓ} → Dec P

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