Automorphisms of the Nilpotent Subalgebras Generated by the Positive Root Vectors of Chevalley Algebras of Some Types Over Communicative Rings ( for Case that There is Only the Trivial Graph Automorphism )

交换环上某些Chevalley代数的由正根基向量生成的幂零子代数的自同构（只有 平凡 的 图自同构的情况）