n JacobiDN[n z, m] == (-1)^((1 - n)/2) Sum[JacobiDN[z + (4 (r EllipticK[m] + s \[Tau] EllipticK[m]))/n, m], {r, 0, n - 1}, {s, 0, n - 1}] /; Element[(n + 1)/2, Integers] && n > 0

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2001-10-29