3 http://hdl.handle.net/10338.dmlcz/107536 3 Some natural operators on vector fields http://hdl.handle.net/10338.dmlcz/107543 Some natural operators on vector fields Fri, 06 Jun 2008 21:29:06 GMT Conjugacy criteria and principal solutions of self-adjoint differential equations http://hdl.handle.net/10338.dmlcz/107542 Conjugacy criteria and principal solutions of self-adjoint differential equations Fri, 06 Jun 2008 21:29:03 GMT Induced isomorphisms of certain ternary semigroups http://hdl.handle.net/10338.dmlcz/107541 Induced isomorphisms of certain ternary semigroups Fri, 06 Jun 2008 21:28:59 GMT A commutativity theorem for associative rings http://hdl.handle.net/10338.dmlcz/107540 A commutativity theorem for associative rings Fri, 06 Jun 2008 21:28:55 GMT