© 1969 by British Computer Society
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The theory of left factored languages: Part 1*

Courant Institute, 251 Mercer Street, New York, USA
Left factored grammars and languages are introduced and their relevance to syntax-directed top-down analysers is discussed. A number of results concerning these languages are proved, including the decidability of left factored grammars. Finally a number of open problems are posed.
Received February 1969.
* This work was carried out in part at the University of Leeds, England, and in part at the Courant Institute with the National Science Foundation, Grant NSFGJ95
Present address: Courant Institute, 251 Mercer Street, New York, New York, 10012, U.S.A.