Definition 16 A context free grammar is called regular if for every production T → w of G, all letters of w, with a possible exception for the last one, are terminals ∗(V ∪{e}) Example V = {S,T};Σ = {a,b} S → abaT T → bbaSaa Theorem 17 A language is regular iffR that assigns a real weight w(e) to each edge e, which may be positive, negative, or zero This chapter describes several algorithms to find the minimum spanning tree of G, that is, the spanning tree T that minimizes the function w(T) = X CBA356 90 H Y R HI T A L R K K yP H V R F L L S V G G D r d v n s e g v A DSD K Y L R L L E q S E H R K S F Q a S v L A E L N N N gF 153 fruit fly The Payoffs To Agricultural Biotechnology Ifpri Publications Repository Ifpri Knowledge Collections Aeg nv stock