The notion of fundamental group also came from topology . there are close relations with simple connectedness in representation theory of algebras for fundamental group, as was in algebraic topology 基本群的概念同樣來自拓?fù)鋵W(xué),同它在代數(shù)拓?fù)渲幸粯?,它在表示論中與單連通性也有密切的聯(lián)系。