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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;]
Published on September 17, 2021
Volume 17, Issue 3
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