We show that the minimal number of singular fibers in a genus-2 Lefschetz fibration over a closed surface of genus h is equal to 5 if h >= 3, 5 or 6 if h = 2 and 6 or 7 if h = 1.
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Tokyo Inst Technol, Dept Math, Meguro Ku, 2-12-1 Oh Okayama, Tokyo 1528551, JapanTokyo Inst Technol, Dept Math, Meguro Ku, 2-12-1 Oh Okayama, Tokyo 1528551, Japan