设f(x)为任意域F上n级矩阵A的可分和不可约的特征多项式.对于给定的g(x)∈F[x],我们给出g(B)=A有解B∈Mn(F)充分必要条件为存在v∈F(u)(F的扩域)使得,(u)=0且,(g(v))=0.进一步,我们给出了有关多项式g(x)=:x^2+ax+b,x^3+ax^2+bx+c,x^m-a和x^q-x+a(q为F的特征)的上矩阵方程有解的等价条件.
Let f(x) be the irreducible and separable characteristic polynomial of n × n matrix A over an arbitrary field F. Giving g(x) ∈ F[x], we show that the matrix equation g(B) = A has a solution B ∈ Mn(F) if and only if there is some v ∈ F(u) (an extension field of F) such that f(u) = 0 and f(g(v)) -= 0. Moreover, we give equivalent conditions of above matrix equation about polynomials g(x)=: x^2 + ax + b, x^3 + ax^2 + bx + c, x^m - a and x^q - x + a (q the characteristic of F).