Mathematical foundations of computer science ...

Thisvolumecontainspapersselectedforpresentationatthe28thSymposiumon MathematicalFoundationsofComputerScience–MFCS2003,heldinBratislava, Slovakia, August 25–29, 2003. MFCS 2003 was organized by the Slovak Society for Computer Science and the Comenius University in Bratislava, in cooperation with other institutions in Slovakia. It was supported by the European Association for Theoretical C- puter Science and the Slovak Research Consortium for Informatics and Mat- matics. The series of MFCS symposia, organized alternately in the Czech Republic, PolandandSlovakiasince1972,hasawell-establishedtradition. TheMFCSs- posiaencouragehigh-qualityresearchinallbranchesoftheoreticalcomputers- ence. Theirbroadscopeprovidesanopportunitytobringtogetherspecialistswho donotusuallymeetatspecializedconferences. Thepreviousmeetingstookplace ? in Jablonna, 1972; Strbsk´ e Pleso, 1973; Jadwisin, 1974; Mari´ ansk´eL´ azn? e, 1975; Gdansk, ` 1976; Tatransk´ a Lomnica, 1977; Zakopane, 1978; Olomouc, 1979; Ry- ? dzina, 1980; Strbsk´ e Pleso, 1981; Prague, 1984; Bratislava, 1986; Carlsbad, 1988; Porabk ¸ a-Kozubnik,1989;Bansk´ aBystrica,1990;KazimierzDolny,1991;Prague, 1992;Gdansk, ` 1993,Ko? sice,1994;Prague,1