D[ExpIntegralE[\[Nu], z], {z, n}] == (-1)^n Pochhammer[1 - \[Nu], n] (ExpIntegralE[\[Nu], z]/z^n + Sum[z^(k - n)/Pochhammer[1 - \[Nu], k + 1], {k, 0, n - 1}]/E^z) /; Element[n, Integers] && n >= 0

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2007-05-02