# Conjunction: Coordination

Last update: 2006-06-22 19:17:31 CEST

- Rules
- Categories
- List constructors

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Coordination is defined for many different categories; here is a sample. The rules apply to lists of two or more elements, and define two general patterns:

- ordinary conjunction: X,...X and X
- distributed conjunction: both X,...,X and X

`VP` conjunctions are not covered here, because their applicability depends on language. Some special cases are defined in `Extra`.

        abstract Conjunction = Cat ** {

## Rules

          fun
            ConjS    : Conj -> [S] -> S ;     -- "John walks and Mary runs"
            ConjAP   : Conj -> [AP] -> AP ;   -- "even and prime"
            ConjNP   : Conj -> [NP] -> NP ;   -- "John or Mary"
            ConjAdv  : Conj -> [Adv] -> Adv ; -- "quickly or slowly"

            DConjS   : DConj -> [S] -> S ;    -- "either John walks or Mary runs"
            DConjAP  : DConj -> [AP] -> AP ;  -- "both even and prime"
            DConjNP  : DConj -> [NP] -> NP ;  -- "either John or Mary"
            DConjAdv : DConj -> [Adv] -> Adv; -- "both badly and slowly"

## Categories

These categories are only used in this module.

          cat
            [S]{2} ;
            [Adv]{2} ;
            [NP]{2} ;
            [AP]{2} ;

## List constructors

The list constructors are derived from the list notation and therefore not given explicitly. But here are their type signatures:

          --  BaseC : C -> C   -> [C] ;  -- for C = S, AP, NP, Adv
          --  ConsC : C -> [C] -> [C] ;
        }