His main contributions are in the areas of real and complex analysis,
number theory,
differential equations,
elementary mathematics and some work on the arithmetical properties of
infinite series. Lubomir Chakalov was a member of the
Royal Czech Academy of Sciences,
Warsaw Academy of Sciences, and a permanent member of the
Bulgarian Academy of Sciences since 1930. In 1950 he received the
Dimitrov Prize and in 1963 he was awarded the title "People's figure of culture." He was an Invited Speaker of the
ICM in 1932 in Zurich and in 1936 in Oslo. The
National Gymnasium of Natural Sciences and Mathematics "Academician Lyubomir Chakalov" is named after him. ==References==