| − | An '''automorphism''' of a mathematical structure A is an [[Isomorphism|isomorphism]] from A to itself.<ref>http://mathworld.wolfram.com/GraphAutomorphism.html</ref> | + | An '''automorphism''' of a mathematical structure A is an [[isomorphism]] from A to itself.<ref>http://mathworld.wolfram.com/GraphAutomorphism.html</ref> |