β Scribed by S.J. Walljasper
No coin nor oath required. For personal study only.
Left-derivation bounded languages are defined as those languages defined from context-free grammars by placing a bound on the number of nonterminals appearing in left-derivations. These languages are generated by left-derivation bounded grammars and form a full AFL not closed under reversal. The left-derivation bounded languages properly contain the nonterminal bounded languages and are properly contained in the derivation bounded languages.
π SIMILAR VOLUMES
necessarily context-free) bounded languages by full AFL operations, or from any set of' bounded context-free languages by full AFL operations and substitution.
Let = {u; d; r; l} be the chain-code picture alphabet such that u (d; r; l) denotes the graphics command to move the drawing pen up (down, right, left) in the 2D Cartesian plane. It is known that the picture membership problem can be solved in polynomial time for each context-free language over {u;