A complete quartic polynomial consists of 15 terms . 一个完整四次的多项式由15项组成。
Under action of uniformly or polynomial distributed load, upper and lower critical loads of revolving shells ( including conical shells, spherical shells and quartic polynomial shells ) with uniform thickness, linearly, exponentially or polynomial variable thickness were evaluated 给出了均布或多项式分布荷载作用下,等厚度、线性、指数型或多项式型变厚度的圆锥壳、球壳或四次多项式型旋转壳的上、下临界荷载。
A . douady had suggested to study dynamics of biquadratic polynomials . by definition, a biquadratic polynomial is the composition of two quadratic polynomials, so it is an even quartic polynomials which can be written as f ( z ) = z4 + az2 + 6, where a, b are parameters . it is easy to see that / has a critical point at 0 and two symmetric critical points at a.douadv曾建议对双二次多项式的动力系统进行研究,所谓双二次多项式就是两个二次多项式的复合,也即偶四次多项式,在一个线型共轭下可以记为fz)=z~4+z~2+b,这里o,b是参数,点0是它的一个临界点,另外还有两个对称的临界点((-a)、2)~2。