Accession Number : AD0657015

Title :   ABSTRACT FAMILIES OF LANGUAGES,

Corporate Author : SYSTEM DEVELOPMENT CORP SANTA MONICA CALIF

Personal Author(s) : Ginsburg,Seymour ; Greibach,Sheila

Report Date : 17 APR 1967

Pagination or Media Count : 60

Abstract : The notion of an abstract family of languages (AFL) as a family of sets of words satisfying certain properties common to many types of formal languages is introduced. Operations preserving AFL are then considered. The concept of an abstract family of acceptors (AFA) is also introduced and shown to give rise to an AFL. A necessary and sufficient condition on an AFL is presented in order that the AFL come from some AFA. Finally, abstract families of transducers (AFA with output) are discussed. (Author)

Descriptors :   (*LANGUAGE, *TRANSDUCERS), THEOREMS, AUTOMATION, OPERATIONS RESEARCH, SYSTEMS ENGINEERING, COMPUTATIONAL LINGUISTICS, SET THEORY, GRAMMARS, CONTEXT FREE GRAMMARS, CONTEXT SENSITIVE GRAMMARS, SEQUENCES(MATHEMATICS), MAPPING(TRANSFORMATIONS), SYMBOLS

Subject Categories : Linguistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE