本文研究了一类重要的形如F=α+εβ+βarctan(β/α)(ε为常数)的弱Berwald(α,β)-度量.利用S-曲率公式,获得了这类度量为弱Berwald度量的充要条件.并且还证明了F为具有标量旗曲率的弱Berwald度量当且仅当它们为Berwald度量且旗曲率消失.
We study an important class of weak Berwald (α,β)-metrics in the form F= α+εβ+β arctan(β/α) ( ε is a constant) on a manifold. By using a formula of the S-curvature, weobtain sufficient and necessary conditions for such metrics to be weak Berwald metrics. We alsoprove that F is a weak Berwald metric with scalar flag curvature if and only if it is a Berwald metric and its flag curvature vanishes.Keywords: (α,β)-metric; weak Berwald metric; flag curvature