With the diet problem, you saw how to formulate a simple, multi-variable problem, how to declare bidimensional parameters in GNU MathProg, and how to interpret the results of a minimization problem.

在日常饮食问题中，我们看到了如何对一个简单的多变量问题进行建模，如何在GNU MathProg中声明二维参数，以及如何解释最小化问题的结果。

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Variable annuities have been a problem for more than a decade.

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But you fail to mention the most important one of all: that a central bank of any country which has only variable access to international capital markets may have a problem in acting as a lender of last resort to its banking system.

ECONOMIST: Letters | The

The director said one increasing problem in 2011 was in the misuse of variable hour contracts, which are sometimes called zero hour contracts.

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