这是正常的，因为从微积分可以知道，任一函数都可以用分段多项式来逼近。
This is normal, and the arbitrary function all can approach with dividing section multinomials because can know from infinitesimal calculus.
给出矩形域上弱奇异积分算子本征值问题分片零次多项式配置法的后验误差估计式。
The posteriori error estimators in the collocation method for integral equation eigenvalue problem with a weakly singular kernel are presented.
利用广义拉盖尔多项式的级数表达式和分步积分法，给出了各向同性谐振子径向矩阵元的另一种表达式。
Another expression of the radial matrix elements for isotropic harmonic oscillator is obtained by using progressional expression of the generalized Laguerre polynomial and the partial integration.
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