Function: nusum (expr, x, i_0, i_1)

    • indefinite hypergeometric summation of expr with respect to x

    Example:
        (%i) nusum(k,k,1,n);
        (%o) n*(n+1)/2

        (%i) nusum(k^7,k,1,n);
        (%o) n^2*(n+1)^2*(3*n^4+6*n^3-n^2-4*n+2)/24

        (%i) nusum((a+k*d),k,0,n);
        (%o) (n+1)*(d*n+2*a)/2

        (%i) nusum(a*r^k,k,0,n);
        (%o) a*r^(n+1)/(r-1)-a/(r-1)


    EXAMPLE: