In: Advanced Math
Let T : V → V be a linear map. A vector v ∈ V is called a fixed point of T if Tv = v. For example, 0 is a fixed point for every linear map T. Show that 1 is an eigenvalue of T if and only if T has nonzero fixed points, and that these nonzero fixed points are the eigenvectors of T corresponding to eigenvalue 1
If
matrix representation of T is M then Tv=Mv again Tv=v implies Mv=v
and since eigen value satisfies it's characteristic equation,we
have that eigen value of M is 1 and since M is the matrix
representation of T , therefore 1 is an eigen value of T.