Osamu Yasuda
Neutrino oscillation phenomenology is briefly reviewed, and impact of the late Professor Masatoshi Koshiba on research on neutrino oscillation is discussed from the viewpoint of phenomenology.
Comments: 19 pages, 7 figures, accepted by PTEP as a paper for "A special issue in memory of Masatoshi Koshiba, a pioneer in experimental particle physics and astrophysics"