He chose an Australian man,Harold Gatty, to do the mathematics that decided the plane's direction.

VOA: special.2011.04.27

John is a mathematical economist and we both love mathematics, but maybe John is going to do more of it than I am.

约翰是个数理经济学家,我们都热爱数学,但是约翰会讲授更多关于数学的内容

耶鲁公开课 - 金融市场课程节选

And now I have to do the mathematics.

现在我需要做一个数学运算。

哈佛公开课 - 计算机科学课程节选