Consider the identity

(i) Verify that the derivative, of order n − 1, of the function

(ii) By differentiating both sides of (2.17) n − 1 times establish that

(iii) Making the change of variable j − n + 1 = k on the right-hand side of the last expression, obtain an alternative proof of Proposition 2.10.

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t = 1+1+2+ = }, \|| < 1. (2.17) j=0