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Document type:
Technical Report 
Author(s):
Hermann Gruber; Markus Holzer 
Title:
Language Operations with Regular Expressions of Polynomial Size 
Abstract:
This work deals with questions regarding to what extent regularity-preserving language operations affect the descriptional complexity of regular expressions. Some language operations are identified which are feasible for regular expressions in the sense that the result of the operation can be represented as a regular expression of size polynomial in that of the operands. We prove that taking language quotients, in particular the prefix and suffix closures, of a regular set can incur at most a qu...    »
 
Keywords:
regular expressions; derivatives; language quotient; cyclic shift; circular shift; descriptional complexity 
Year:
2008 
Year / month:
2008-05-01 00:00:00 
Pages:
16