Song Xiuchao

We don’t have enough information about this author to calculate their statistics. If you think this is an error let us know.
Sorry, we do not have enough data to show an influence graph for this author.
Learn More
The classification of filter is discussed by analysis the relationship between the filter and the intersection of all members. It is obtained that on the infinite set there exists three types of filter, which are free, principal and preprincipal filter. It is proved that the sufficient and necessary condition of u is a free ultra filter by the properties of(More)
  • 1