研究非自治Birkhoff系统的梯度表示。给出一类非自治Birkhoff系统和非自治广义Birkhoff系统成为梯度系统的条件,并举例说明结果的应用。
A gradient representation for a type of non-autonomous Birkhoffian systems is studied. The conditions under which the non-autonomous Birkhoffian system or the non-autonomous generalized Birkhoffian system can be considered as a gradient system are obtained. Two examples are given to illustrate the application of the re-sults.