Let V be the vector space of polynomials of degree less than of equal to n.Show that the derivative operator on V is nilpotent of index n+1.
Let P denotes a polynomial and D denotes the derivative operator. Then let for Then Then Hence applying this repetitively we get, deg for . For the degree is 0 hence a constant polynomial. So for the polynomial vanishes. Hence for any polynomial of degree Also for the ploynomial , we see, Hence is not the zero operator on V. Hence it is nilpotent of index n+1.
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