Content created by Jonathan Prieto-Cubides, Fredrik Bakke, Egbert Rijke and Amélia Liao.

Created on 2022-07-05.
Last modified on 2023-03-13.

module organic-chemistry.alkenes where
open import elementary-number-theory.natural-numbers

open import foundation.dependent-pair-types
open import foundation.embeddings
open import foundation.universe-levels

open import organic-chemistry.hydrocarbons
open import organic-chemistry.saturated-carbons

open import univalent-combinatorics.finite-types


An n-alkene is a hydrocarbon equipped with a choice of carbons, each of which has a double bond. For an n-alkene, the embedding from the given type (the first component of the n-alkene structure) specifies which carbons have double bonds. For example, 1-butene and but-2-ene have the same geometry, and the embedding is what differentiates them (while the third tautometer, isobutylene, is branched, thus has a different geometry).


n-alkene : {l1 l2 : Level}  hydrocarbon l1 l2    UU (lsuc lzero  l1  l2)
n-alkene H n =
  Σ (UU-Fin lzero n) λ carbons 
    Σ ( type-UU-Fin n carbons  vertex-hydrocarbon H)
      ( λ embed-carbons 
        ( c : type-UU-Fin n carbons) 
        pr1 (has-double-bond-hydrocarbon H (pr1 embed-carbons c)))

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