
Mark B. answered 04/30/23
Experienced Computer Science Tutor with a Master's Degree in CS
string of symbols in a derivation -> sentence
a sentential form that has only terminal symbols -> string
the leftmost nonterminal in each sentential form is the one that is expanded -> leftmost derivation
may be neither leftmost nor rightmost -> derivation
the rightmost nonterminal in each sentential form is the one that is expanded -> rightmost derivation