$\text Prof. RNDr.$ Bretislav Novak, $\text DrSc.$ (1938-2003)
would be seventy

A. A. Karatsuba, S. Porubsky, M. Rokyta, Z. Vlasek

Anatolii Alexeevich Karatsuba, Department of Number Theory, Steklov Institute of Mathematics of Russian Academy of Sciences, 8, Gubkina str., 119991 Moskva, Russia, e-mail: karatsuba@mi.ras.ru; Stefan Porubsky, Institute of Computer Science, Academy of Sciences of the Czech Republic, Pod Vodarenskou vezi 2, Praha 8, 182 07, e-mail: porubsky@cs.cas.cz; Mirko Rokyta, Department of Mathematical Analysis, Faculty of Mathematics and Physics, Charles University, Sokolovska 83, Praha 8-Karlin, 186 75, e-mail: rokyta@karlin.mff.cuni.cz; Zdenek Vlasek, Department of Mathematical Analysis, Faculty of Mathematics and Physics, Charles University, Sokolovska 83, Praha 8-Karlin, 186 75, e-mail: vlasek@karlin.mff.cuni.cz