adj.四乘幂的；四次的
n.四乘幂；四次方程式
That leads to biquadratic equations for solution. 它们又引出待解的双二次方程。
The global topological structure of the homogeneous biquadratic systems is discussed and thier coefficient conditions are given. 讨论了一类齐四次系统的全局结构，并给出了它们的系数条件。
Parametric biquadratic equation whose roots are characteristic wave numbers is obtained after setting the determinant of eigen matrix to zero. 特征波数的计算涉及到张量运算、矩阵运算、公式化简等。
The approximation of the parabolic integro-differential equations is studied with anisotropic biquadratic finite element. 摘要研究具有各向异性特征的双二次元对抛物积分微分方程进行了逼近。
In this paper, the approximation of the second order parabolic equation is studied with the anisotropic biquadratic element. 摘要本文研究具有各向异性特征的双二次元对二阶抛物方程的逼近。
