Unrestricted State Complexity Of Binary Operations On Regular And Ideal Languages
MetadataShow full item record
We study the state complexity of binary operations on regular languages over diﬀerent alphabets. It is known that if L′m and Ln are languages of state complexities m and n, respectively, and restricted to the same alphabet, the state complexity of any binary boolean operation on L′m and Ln is mn, and that of product (concatenation) is m2n − 2n−1. In contrast to this, we show that if L′m and Ln are over diﬀerent alphabets, the state complexity of union and symmetric diﬀerence is (m + 1)(n + 1), that of diﬀerence is mn + m, that of intersection is mn, and that of product is m2n + 2n−1. We also study unrestricted complexity of binary operations in the classes of regular right, left, and two-sided ideals, and derive tight upper bounds. The bounds for product of the unrestricted cases (with the bounds for the restricted cases in parentheses) are as follows: right ideals m + 2n−2 + 2n−1 + 1 (m + 2n−2); left ideals mn + m + n (m + n − 1); two-sided ideals m+2n (m+n−1). The state complexities of boolean operations on all three types of ideals are the same as those of arbitrary regular languages, whereas that is not the case if the alphabets of the arguments are the same. Finally, we update the known results about most complex regular, right-ideal, left-ideal, and two-sided-ideal languages to include the unrestricted cases.
Cite this version of the work
Janusz Brzozowski, Corwin Sinnamon (2017). Unrestricted State Complexity Of Binary Operations On Regular And Ideal Languages. UWSpace. http://hdl.handle.net/10012/12498
Showing items related by title, author, creator and subject.
Aldubaikhy, Khalid (University of Waterloo, 2019-10-24)Very high throughput and high-efficiency wireless local area networks (WLANs) have become essential for today's significant global Internet traffic and the expected significant global increase of public WiFi hotspots. Total ...
Brzozowski, Janusz (World Scientific Publishing, 2013-09-01)Sequences (L-n vertical bar n >= k), called streams, of regular languages L-n are considered, where k is some small positive integer, n is the state complexity of L-n, and the languages in a stream differ only in the ...
Brzozowski, Janusz; Sinnamon, Corwin (Institute of Informatics: University of Szeged, 2017)A language L over an alphabet E is prefix-convex if, for any words x, y, z is an element of Sigma*, whenever x and xyz are in L, then so is xy. Prefix-convex languages include right-ideal, prefix-closed, and prefix-free ...