biquadratic equation

1. In Chapter, biquadratic element approximation of convection-diffusion-reaction equation is considered under graded meshes, overcoming some difficulties, and some higher order uniformly convergence results are obtained.
   第四章考虑了双二次单元对对流扩散问题的逼近，克服了已有的困难得到了高阶的一致收敛性结果。

noun

1. an equation of the fourth degree

   Synonym:    biquadratic