HypergeometricPFQ[{-n, b, c, d}, {b - k, c - l, d - m}, 1] == 0 /; Element[n, Integers] && n >= 0 && Element[m, Integers] && m >= 0 && Element[k, Integers] && k >= 0 && Element[l, Integers] && l >= 0 && Inequality[0, LessEqual, k + l + m, Less, n]

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2001-10-29