quartic equation

基本解釋

In this paper, we discuss when a quartic equation has no real roots, and obtain a necessary and sufficient condition on a quartic equation which has no real roots.
本文討論了一元四次方程無實(shí)根的一些充分、必要條件，并得到了一元四次方程無實(shí)根的一個(gè)充要條件。
The curvilinear equation of quartic polynomial is used to simulate the boundary of the pile hole to improve the presumption of previous research results which are not well suitable.
重點(diǎn)對(duì)孔壁邊界曲線的幾何形狀及其曲線方程的假定方法展開研究，并應(yīng)用四次多項(xiàng)式模擬孔壁邊界曲線。
118.145.16.223
Given the velocity ratio of S-to P-waves, the depth of reflector and the offset, the horizontal distance between source and the converting point can be determined by solving a quartic equation.
如果我們已知介質(zhì)中橫波與縱波速度的比值、水平界面的埋藏深度和炮檢距，炮點(diǎn)到共轉(zhuǎn)換點(diǎn)的水平距離就可以通過解一個(gè)四次方程求出。