The monotonicity of a scalar function is equivalent to the positivity of its increments and to the convexity of its integral. I sometimes feel that this high-school mathematical statement alone underlines the entire algorithmic tractability of modern information engineering. And replacing “scalar function” with “system” defines a largely open research program in control.

中文翻译：

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积极的态度[来自编辑]

这标量函数的单调性等价于其增量的积极性和其积分的凸性。有时我觉得这个高中数学陈述本身就强调了现代信息工程的整个算法的易处理性。用“系统”取代“标量函数”定义了一个很大程度上开放的控制研究项目。