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Line 152: This is not a generalization of the above definition, since, for a string ''s'' and distinct characters ''a'', ''b'', Hopcroft's and Ullman's definition implies {''sa''} / {''b''} yielding {}, rather than { ε }. The left quotient (when ~~definied~~defined similar to Hopcroft and Ullman 1979) of a singleton language ''L''<sub>1</sub> and an arbitrary language ''L''<sub>2</sub> is known as [[Brzozowski derivative]]; if ''L''<sub>2</sub> is represented by a [[regular expression]], so can be the left quotient.<ref>{{cite journal\| author=Janusz A. Brzozowski\| authorlink=Janusz Brzozowski (computer scientist)\|title=Derivatives of Regular Expressions\| journal=J ACM\| year=1964\| volume=11\| pages=481–494\| doi=10.1145/321239.321249}}</ref> ==Syntactic relation==

String operations: Difference between revisions