The physical parameters of the reactor core are calculated by method of the two-grouptheory.
应用双群理论计算了反应堆堆芯物理常数。
2
A formula calculating the critical mass in reactor is recommended for checking the two-grouptheory.
介绍了一个计算反应堆临界质量的公式，用来校验双群理论。
3
An interesting problem in the study of bifurcation theory is to determine when two bifurcation problems are equivalent with respect to some group of equivalences.