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(f(k))_(k >= 0) is a multiplier sequence, so x^k -> f(k) x^k maps every real-rooted polynomial to a real-rooted polynomial or zero (Laguerre; see T. Craven and G. Csordas, Multiplier sequences for fields, Illinois J. Math. 21 (1977); Polya--Schur, Theorem 40 of P. Branden, arXiv:1410.6601: sum_k f(k) x^k / k! = f(theta) e^x = C e^x x^m prod (1 + x/a_j), a_j > 0); f(k) has one sign for k >= 0, so coefficients of one sign stay of one sign; applied to f(n, .) for each n","lean_route":null,"lean_declarations":["RealRooted.isMultiplierSequence_eval_of_roots_nonpos","RealRooted.isPFMultiplierSequence_eval_of_roots_nonpos","RealRooted.isMultiplierSequence_iff_preserves"],"certificate_hash":"5357d88e2945f5ac9bb8304451f1facb4ed55b90d14fb66c34c6c848858e0099","verification_polytool":"replayed","verification_lean":"not_attempted","claims":[{"claim":"real_rooted","from_index":0,"region":{"upper":{"closed":true,"value":"0"}}},{"claim":"interlacing","from_index":1,"kind":"weak","orientation":"unordered"}],"premises":[{"position":0,"node_id":"n-623036dc25b33b8c","role":"sequence","name":"basis_map_A013609 of Triangle of coefficients of (x+1)*(x+3)*(x+6)*...*(x+n(n+1)/2).","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:           2,            8;\n  2:           8,           80,            108;\n  3:          56,          944,           2916,           2304;\n  4:         616,        14864,          74556,         129024,           72000;\n  5:        9856,       311744,        2196216,        6040704,         7200000,         3110400;\n  6:      216832,      8514176,       77776560,      296879616,       554821200,       503884800,        177811200;\n  7:     6288128,    295481472,     3328306416,    16352597504,     42066781200,     59353440768,      43563744000,      13005619200;\n  8:   232660736,  12743795328,   171015335856,  1031069328896,   3396138123600,   6557561183232,    7428495723264,    4577977958400,   1185137049600;\n  9: 10702393856, 669972450048, 10447324003296, 74791642866176, 301216478061600, 741787315247232, 1145012048216064, 1083814238453760, 575976606105600, 131681894400000;\n","recurrence_sentence":"The row polynomials satisfy (4*n-4)*P(n,x) = -(n^5-n^4+3*n^3+n^2+4+(8*n^5-8*n^4+8*n^3+8*n^2-16*n)*x-(36*n^5-36*n^4-36*n^3+36*n^2)*x^2)*P(n-2,x) + ((8*n^5-8*n^4+8*n^3+8*n^2-16*n)*x^2+(16*n^5-16*n^4-16*n^3+16*n^2)*x^3)*d/dx P(n-2,x) + (4*n^3+4*n+(16*n^3-16*n)*x)*P(n-1,x) - (16*n^3-16*n)*x^2*d/dx P(n-1,x) for n >= 2, with P(0,x) = 1, P(1,x) = 2 + 8*x.","mathematica":"P[0, x_] := 1;\nP[1, x_] := 2 + 8*x;\nP[n_, x_] := P[n, x] = Expand[Together[(-(n^5 - n^4 + 3*n^3 + n^2 + 4 + (8*n^5 - 8*n^4 + 8*n^3 + 8*n^2 - 16*n)*x - (36*n^5 - 36*n^4 - 36*n^3 + 36*n^2)*x^2)*P[n - 2, x] + ((8*n^5 - 8*n^4 + 8*n^3 + 8*n^2 - 16*n)*x^2 + (16*n^5 - 16*n^4 - 16*n^3 + 16*n^2)*x^3)*D[P[n - 2, x], x] + (4*n^3 + 4*n + (16*n^3 - 16*n)*x)*P[n - 1, x] - (16*n^3 - 16*n)*x^2*D[P[n - 1, x], x])/(4*n - 4)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 1; v[2] = 2 + 8*x; for(n = 2, N, my(i = n + 1); v[i] = (-(n^5 - n^4 + 3*n^3 + n^2 + 4 + (8*n^5 - 8*n^4 + 8*n^3 + 8*n^2 - 16*n)*x - (36*n^5 - 36*n^4 - 36*n^3 + 36*n^2)*x^2)*v[i - 2] + ((8*n^5 - 8*n^4 + 8*n^3 + 8*n^2 - 16*n)*x^2 + (16*n^5 - 16*n^4 - 16*n^3 + 16*n^2)*x^3)*deriv(v[i - 2], x) + (4*n^3 + 4*n + (16*n^3 - 16*n)*x)*v[i - 1] - (16*n^3 - 16*n)*x^2*deriv(v[i - 1], x))/(4*n - 4)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i - 1, v[i])))};\nT(9)","reading":{"first_row":0,"offset":0,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-ecd77b030b8fab94","steps":["basis A013609","(\u03b8+1)\u00b2"],"edges":["e-42bb566932c0b2ac","e-8e40af100e3932b8"],"text":"A128813 \u2192 basis A013609 \u2192 (\u03b8+1)\u00b2"},"headline":"A128813 \u2192 basis A013609 \u2192 (\u03b8+1)\u00b2","chain":null}