“…Bar-Hillel, Perles, and Shamir 121 found a pumping lemma for context-free languages and recently Ehrenfeucht and Rozenberg [3] found that deterministic ETOL languages have a similar property. In this paper we study some classes of languages having a pumping property.…”
We study some pumping properties and the classes of languages having these properties. We describe how these classes are interrelated and related to the Chomsky hierarchy of languages. We further study their closure properties.
“…Bar-Hillel, Perles, and Shamir 121 found a pumping lemma for context-free languages and recently Ehrenfeucht and Rozenberg [3] found that deterministic ETOL languages have a similar property. In this paper we study some classes of languages having a pumping property.…”
We study some pumping properties and the classes of languages having these properties. We describe how these classes are interrelated and related to the Chomsky hierarchy of languages. We further study their closure properties.
“…r . The number of/-random words for a function ƒ which is not "too slow" over an alphabet consisting of at least two letters is "rather large" which is stated in the following theorem proved in [5]. …”
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