摘要
设Ａ是含单位元的交换Ｂａｎａｃｈ代数，ａ＝（ａ＿１，…，ａ＿ｎ）是Ａ中ｎ－元组，本文讨论了由Ａ确定的ａ的代数型联合谱以及由Ａ的理想导出的代数型联合本质谱的有关问题①。
et A be a commuting Banach algebra containing unit element, a = (a_1,...,a_n) be an n-tuple in A. In this paper, we study the joint spectrum defined by A and the joint essential spectrum defined by an ideal of A.
