Secondly, a type of (2+1)-dimensional multi-component integrable hierarchy is obtained with the help of a (2+1)-dimensional zero-curvature equation and Tu scheme.
其次，运用2+1维的零曲率方程和屠格式得到了一类2+1维的多分量的可积系。
2
A zero-curvature criterion is proposed to determine the practical collapse load.
本文提出一种确定实际极限载荷的零曲率准则。
3
It is concluded that: (1) the zero-curvature point is a characteristic point of the experimental curve and that the new criterion is an objective criterion without any artificial coefficient.