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arXiv 1402.3699math.RA
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交换环

Interchange Rings

Charles Edmunds

摘要:

交换环(R,+,*)是具有第二个二元运算的阿贝尔群,其定义使得交换律(x+y)*(u+v)=(x*u)+(y*v)成立。交换准环是基于一个可能不是交换群的相同结构。它表明,给定任何组,G,每个交换(近)环的基础上,该集团是由一对自同态的G的图像交换,所有的交换(近)环的基础上G可以用这种方式。为了得到结合交换环,G的自同态半群中的自同态必须是交换幂等元。当G是阿贝尔群理论模拟的同时对角化的幂等线性算子,并表明,对自同态产生关联交换环可以对角化,然后把一个标准形式。对于基于有限阿贝尔群A的结合交换环的不同同构类的个数,可以给出一个最佳可能上界为4 ^r,其中A是r个素数幂阶循环群的直和.若A是同一个素数幂阶循环群的r个副本的直和,我们证明了基于A的结合交换环恰有(r+1)(r+2)(r+3)/6个不同的同构类.给出了几个例子,并对交换环的一般理论作了进一步的评论。

英文摘要:

An interchange ring,(R,+,*)is an abelian group with a second binary operation defined so that the interchange law (x+y)*(u+v)=(x*u)+(y*v)holds. An interchange near ring is the same structure based on a group which may not be abelian. It is shown that given any group,G,each interchange(near)ring based on that group is formed from a pair of endomorphisms of G whose images commute, and that all interchange (near)rings based on G can be characterized in this manner. To obtain an associative interchange ring, the endomorphisms must be commuting idempotents in the endomorphism semigroup of G. When G is abelian we develop a group theoretic analogue of the simultaneous diagonalization of idempotent linear operators and show that pairs of endomorphisms which yield associative interchange rings can be diagonalized and then put into a canonical form. A best possible upper bound of 4^r can be given for the number of distinct isomorphism classes of associative interchange rings based on a finite abelian group A which is a direct sum of r cyclic groups of prime power order. If A is direct sum of r copies of the same cyclic group of prime power order, we show that there are exactly (r+1)(r+2)(r+3)/6 distinct isomorphism classes of associative interchange rings based on A. Several examples are given and further comments are made about the general theory of interchange rings.

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