半群S—分次模范畴的同态集与冲积R＃S^＊的分次Jacobson根

对于任意半群S ,证明了半群分次模范畴Rgr的 1个结果 :在一定条件下 ,HOMR(M ,N) =HomR(M ,N) (其中HOM R(M ,N)是从M到N的所有s(s∈S)次分次同态作成的群 ,HomR(M ,N)是从M到N的所有R模同态作成的群 ,M ,N∈R gr ,M∈RMod) ,推广了群分次环与模的相应结果 .对任意半群的冲积R #S ,讨论了当R有 1且S为右可消幺半群时 ,R #S 与其分量子环Re 的理想间的关系 ;并证明了当S为左可消幺半群时 ,R #S 的J根与R的分次J根之间的关系 :J(R #S ) JS(R) #S ,其中JS(R)为R的所有弱拟正则分次左理想的和 .

Some Properties of a Class Self-homom orphism ofBCI-algebras

Some properties about stable subset S(θ n) and image Im(θ n) of self homomorphism \{θ n:x→0*x n\} are discussed. The characterization that Im(θ n) becomes an ideal of BCI algebra X is given.

Split graphs whose half-strong endomorphisms form a monoid

In this paper, the half-strong, the locally strong and the quasi-strong endomorphisms of a split graph are investigated. Let X be a split graph and let End（X）, hEnd（X）, 1End（X） and qEnd（X） be the endomorphism monoid, the set of all half-strong endomorphisms, the set of all locally strong endomorphisms and the set of all quasi-strong endomorphisms of X, respectively. The conditions under which hEnd（X） forms a submonoid of End（X） are given. It is shown that 1End（X） = qEnd（X） for any split graph X. The conditions under which 1End（X） （resp. qEnd（X）） forms a submonoid of End（X） are also given. In particular, if hEnd（X） forms a monoid, then 1End（X） （resp. qEnd（X）） forms a monoid too.