Every countable open filter base which has an only accumulationpoint in X is convergent to the accumulationpoint;
X中每个有唯一聚点的可数开滤子基收敛于该聚点；
2
Molecular net, ideal S-limit point and S-accumulationpoint are introduced into LF topological space, and the condition and property of S-convergence and S-accumulation are discussed.
The article mainly discusses the commonly occurred problems during the judgment of the course credit, the calculation of credit accumulationpoint and the average credit accumulationpoint.