1. A note on the three-segment problem Creator: Doležal, Martin Format: bez média and svazek Type: model:article and TEXT Subject: three-segment problem and cluster sets Language: English Description: We improve a theorem of C. L. Belna (1972) which concerns boundary behaviour of complex-valued functions in the open upper half-plane and gives a partial answer to the (still open) three-segment problem. Rights: http://creativecommons.org/publicdomain/mark/1.0/ and policy:public