2 http://hdl.handle.net/10338.dmlcz/116906 2 Academician Otakar Borůvka nonagerian http://hdl.handle.net/10338.dmlcz/102310 Academician Otakar Borůvka nonagerian Conditions for transitive principal tolerances http://hdl.handle.net/10338.dmlcz/102309 Conditions for transitive principal tolerances Functional model for commuting isometries http://hdl.handle.net/10338.dmlcz/102308 Functional model for commuting isometries On a class of linear $n$-th order differential equations http://hdl.handle.net/10338.dmlcz/102307 On a class of linear $n$-th order differential equations