Let T = c 1 T 1 + c 2 T 2 + c 3 T 3 − c 4(T 1 T 2 + T 3 T 1 + T 2 T 3), where T 1, T 2, T 3 are three n × n tripotent matrices and c 1, c 2, c 3, c 4 are complex numbers with c 1, c 2, c 3 nonzero. In this article, necessary ...