简介:ItisknownthatthereexistsanisogenysortofChevalleygroupsG(∑,F)associatedtoanyindecomposablerootsystem∑andanyfieldF.InthispapertheauthordeterminesallnontfivialhomomorphismsfromG(∑,k)toG(∑,K)whentherootsystem∑isoftypeCnorG2,andthefieldskandKarefinitefieldsofcharacteristiep.