Conjunction

conj, possible values are but, and, or, comma, scolon, to, disc, nil
The conj feature is specified in the lexicon for each conjunction and is passed up to the root node of the conjunction tree. If the conjunction is and, the root agr num is plural, no matter what the number of the two conjuncts. With or, the the root agr num is equated to the agr num feature of the right conjunct. The conj=disc feature is only used at the root of the CONJs tree. It blocks the adjunction of one CONJs tree on another. The following equations are used, where S_r is the substitution node and S_c is the root node:

(619)0(619

(620)

S_r.t:conj = disc  (620)0(620

(621)

S_c.b:conj = and/or/but/nil