1 http://hdl.handle.net/10338.dmlcz/143075 1 Conference announcements http://hdl.handle.net/10338.dmlcz/143082 Conference announcements Projective metrizability in Finsler geometry http://hdl.handle.net/10338.dmlcz/143081 Projective metrizability in Finsler geometry On the inverse variational problem in nonholonomic mechanics http://hdl.handle.net/10338.dmlcz/143080 On the inverse variational problem in nonholonomic mechanics Witt algebra and the curvature of the Heisenberg group http://hdl.handle.net/10338.dmlcz/143079 Witt algebra and the curvature of the Heisenberg group