Faculty of Engineering Kyushu Sangyo University 3-1 Matsukadal 2-Chome Higashi-ku Fukuoka 813-8503 Japan;
Department of Architectural Engineering Hiroshima Institute of Technology 2-1-1 Miyake Saeki-ku Hiroshima 731-5193 Japan;
Sharp coefficient bound; Sharp covering theorem; Sharp growth theorem; Starlike mapping; Zero of order k;