Global ETD Search
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Showing 1 to 2 of 2 for “"Dot-Depth Problem"”.
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The Forbidden Pattern Approach to Concatenation Hierarchies
… the question asking for the computability of the dot-depth of star-free regular languages. Here one has to determine for a given star-free regular language the minimal number of alternations between concatenation on one hand, and intersection, union, complement on the other hand. This question was …
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Forbidden-Patterns and Word Extensions for Concatenation Hierarchies
… languages can be measured with the so-called dot-depth. This measure leads to concatenation hierarchies like the dot-depth hierarchy (DDH) and the closely related Straubing-Thérien hierarchy (STH). The question whether the single levels of these hierarchies are decidable is still open and is …