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D preserves real-rootedness by Rolle's theorem and p + c p' is real-rooted for every real c by Rolle's theorem applied to e^(x/c) p; Polya--Schur 1914); when the coefficients of phi have one sign, coefficients of one sign stay of one sign; applied to phi(n, .) for each n","lean_route":null,"lean_declarations":["RealRooted.splits_add_C_mul_derivative_all","RealRooted.splits_C_mul_add_derivative","Polynomial.Splits.derivative"],"certificate_hash":"117b590c85a867b2fa949e8c0d8e1a7a3b076fc71fb5823a2b05dea0813ca91b","verification_polytool":"replayed","verification_lean":"not_attempted","claims":[{"claim":"real_rooted","from_index":1,"region":{"upper":{"closed":true,"value":"0"}}},{"claim":"interlacing","from_index":2,"kind":"weak","orientation":"unordered"}],"premises":[{"position":0,"node_id":"n-58f68e861f34b78a","role":"sequence","name":"Triangle read by rows, S_3(n, k) where S_m(n, k) are the Stirling-Frobenius subset numbers of order m; n >= 0, k >= 0.","uses":{"claim":"real_rooted","from_index":1,"region":{"upper":{"closed":true,"value":"0"}}},"uses_text":"Every row P_n, n >= 1, is zero or real-rooted with all roots in (-inf, 0]"}]}],"used_by":[],"used_by_total":0,"links":[],"oeis":[],"bfiles":[],"oeis_texts":[{"oeis_id":"","target":"node","first_row":1,"oeis_offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false,"rows_shown":10,"polytool_commit":"c48629374597092cc41ef4d6273f37991516f984","triangle_example":"Triangle begins:\n   1:      1;\n   2:      3,        1;\n   3:     11,        9,        1;\n   4:     47,       69,       18,        1;\n   5:    219,      521,      237,       30,        1;\n   6:   1063,     3981,     2810,      605,       45,       1;\n   7:   5251,    30849,    31941,    10390,     1290,      63,      1;\n   8:  26127,   241669,   356538,   164661,    30310,    2436,     84,    1;\n   9: 130379,  1907481,  3947917,  2495990,   639051,   75082,   4214,  108,   1;\n  10: 651383, 15129981, 43557210, 36852285, 12621735, 2032695, 164976, 6822, 135, 1;\n","recurrence_sentence":"The row polynomials satisfy P(n,x) = -(10-2*x-2*x^2)*P(n-2,x) - (6*x-6*x^2)*d/dx P(n-2,x) + (7-x)*P(n-1,x) + 3*x*d/dx P(n-1,x) for n >= 3, with P(1,x) = 1, P(2,x) = 3 + x.","mathematica":"P[1, x_] := 1;\nP[2, x_] := 3 + x;\nP[n_, x_] := P[n, x] = Expand[-(10 - 2*x - 2*x^2)*P[n - 2, x] - (6*x - 6*x^2)*D[P[n - 2, x], x] + (7 - x)*P[n - 1, x] + 3*x*D[P[n - 1, x], x]];\nTable[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten","pari":"P(N) = {my(v = vector(N)); 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