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On Separation by Locally Testable and Locally Threshold Testable Languages

Thomas Place ; Lorijn van Rooijen ; Marc Zeitoun.

A separator for two languages is a third language containing the first one and disjoint from the second one. We investigate the following decision problem: given two regular input languages, decide whether there exists a locally testable (resp. a locally threshold testable) separator. In both cases,&nbsp;[&hellip;]

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Separation for dot-depth two

Thomas Place ; Marc Zeitoun.

The dot-depth hierarchy of Brzozowski and Cohen classifies the star-free languages of finite words. By a theorem of McNaughton and Papert, these are also the first-order definable languages. The dot-depth rose to prominence following the work of Thomas, who proved an exact correspondence with the&nbsp;[&hellip;]

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