By using the density theory of theories of Numbers, the article gives the density discrimination method determining the convergence and divergence characteristic of the positive term series.
借鉴数论方法中的密率论，给出判别正项级数敛散性的密率判别法，此方法特别适用于判定一些较难或不能给出通项表达式的级数的敛散性。
The present paper introduces the optimized design of valve springs of the internal-combustion engine by the duality method of the geometric programming with the positive term equations of constraint.
本文对内燃机汽门弹簧进行优化设计，采用了约束正定式几何规划对偶法。
The present paper introduces the optimized design of valve springs of the internal-combustion engine by the duality method of the geometric programming with the positive term equations of constraint.
本文对内燃机汽门弹簧进行优化设计，采用了约束正定式几何规划对偶法。
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