椭圆投影 meaning in English

ellipicity projection
elliptic projection
elliptical projection

In chapter three , we consider the finite volume element mstheods for nonlinear hyperbolic problems on the basic of the chapter three , optimal order error estimates in the h1 , l2norms and w1 , almost optimal error estimates in l are also demonstrated
在第二章的基础上也得到了h ~ 1 ， l _ 2和w ~ ( 1 , )误差估计以及l _最优误差估计和近似解和真解的广义椭圆投影间的超收敛估计。
In chapter two , we consider the finite volume element methods for nonlinear parabolic problems optimal order error estimates in the h1 , l2norms and w1 , almost optimal error estimates in l are demonstrated . moreover superconvergence in the error between the approximate solution and the generalized elliptic projection of the exact solution is also shown
第二章考虑非线性抛物方程的初值问题的体积有限元法，并证明了h ~ 1 ， l _ 2和w ~ ( 1 , )误差估计以及l _最优误差估计，而且还得到了近似解和真解的广义椭圆投影间的超收敛估计。