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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":"238356d84ae3b56748fa9423ac07910557d54e360bace1a953b70e7dc6f05291","verification_polytool":"replayed","verification_lean":"not_attempted","claims":[{"claim":"real_rooted","from_index":0,"region":{"upper":{"closed":true,"value":"0"}}}],"premises":[{"position":0,"node_id":"n-1d424c7e19773e5b","role":"sequence","name":"Triangular array:  row n gives the coefficients of the polynomial p(n,x) defined in Comments.","uses":{"claim":"real_rooted","from_index":0,"region":{"upper":{"closed":true,"value":"0"}}},"uses_text":"Every row P_n, n >= 0, 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":0,"oeis_offset":0,"reversed":false,"trim_zeros":"none","regular_triangle":false,"rows_shown":10,"polytool_commit":"c48629374597092cc41ef4d6273f37991516f984","triangle_example":"Triangle begins:\n  0:        1;\n  1:        4,        1;\n  2:       17,        5;\n  3:       88,       30,       1;\n  4:      540,      202,      11;\n  5:     3840,     1530,     108,     1;\n  6:    31080,    12960,    1077,    19;\n  7:   282240,   121800,   11328,   280,   1;\n  8:  2842560,  1260000,  127260,  3896,  29;\n  9: 31449600, 14243040, 1532160, 54460, 600, 1;\n","recurrence_sentence":"The row polynomials satisfy P(n,x) = -x^2*P(n-4,x) - 2*n*x*P(n-3,x) - (n^2+n-2*x)*P(n-2,x) + (2*n+2)*P(n-1,x) for n >= 4, with P(0,x) = 1, P(1,x) = 4 + x, P(2,x) = 17 + 5*x, P(3,x) = 88 + 30*x + x^2.","mathematica":"P[0, x_] := 1;\nP[1, x_] := 4 + x;\nP[2, x_] := 17 + 5*x;\nP[3, x_] := 88 + 30*x + x^2;\nP[n_, x_] := P[n, x] = Expand[-x^2*P[n - 4, x] - 2*n*x*P[n - 3, x] - (n^2 + n - 2*x)*P[n - 2, x] + (2*n + 2)*P[n - 1, x]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); 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