A least-squares mixed finite element methods for the first-order system formulation of second-order elliptic problems and a formulation for the infinite boundary conditions are presented.

研究了无穷边界的二阶椭圆问题，探讨了将其转化为一阶系统的最小二乘有限元逼近方法。

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The other area that the purely technical PM may be challenged is the formulation of an eco-system, where a consumer product is the foundation for revenues from other apps, like downloadable games, or advertising.

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This is usually said to be, a rule of thumb, about 20% of the sum collected or, in another formulation, perhaps 35% of the marginal revenue of the system.

FORBES: US Incomes Are Rising But It's All Going on Health Care

Technical tinkering, such as changing the formulation of a drug from a fast-acting pill to a slow-release system, is a common tactic.

ECONOMIST: Prescription drugs