Finally, a sufficient and necessary condition of the diagonalizable block compound matrices is proved.

最后让明了块复合矩阵可对角化的一个充要条件。

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A sufficient and necessary condition is given that the algebraic immunity of a Boolean function is not more than a fixed value.

借助覆盖向量刻画了代数免疫布尔函数的特征，给出布尔函数代数免疫不大于某确定值的充要条件。

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This paper present a sufficient and necessary condition of constructing quintic PH curves and analyze the geometric meaning of the control polygon.

本文给出了构成五次PH曲线的充要条件，分析了其控制多边形的几何意义。

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Good analysts are likely quite skilled at mathematical modeling, but it is a necessary and not sufficient condition for being a good analyst.

FORBES: What Makes Analytics Wizards So Good? They Do Everything Backwards

Money is a necessary but not a sufficient condition for the good life, for happiness and wisdom.

FORBES: How Much Happiness Can Money Buy?