Then, the application of the lowest order mixed finite element, we construct the grid unit and the edge of the base function, and then using the method, this model into a linear algebraic equations, which is transformed into solving the coefficients of the equations. Finally, we can get the approxim

And then, the application of the minimum order $mixed, we construct a grid on the base unit and function, followed by method, this model will be a problem into a linear algebraic equations that can be translated into a set of equations for the coefficients. Finally, we can get by with an approximate

Then, applies the most low-order mix Yuan, on our structure grid the unit and the side primary function, then uses the method, this model question transformation is a simultaneous linear algebra equation, thus transforms as the solution system of equations coefficient.Finally, may obtain the approxi

And then, applying mixed finite element of lowest-order, we constructed on a grid basis function of the unit and, then, the model problem into a linear algebraic group, into a factor for solving equations. Finally, we can get error estimation of the approximate solutions and real solutions, as well

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