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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":"eff4949a5c2e3e7ac67a84cbd5b4f323ab0172acd0518f9d3cb7d24dfbf6c7c0","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-b8883330fe0b24f8","role":"sequence","name":"basis_map_A007318 of Triangle read by rows: coefficients of 1; 1(X+2); 1(X+2)(X+3); 1(X+2)(X+3)(X+4); ....","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:         0;\n  1:         2;\n  2:        17,        12;\n  3:       133,       196,         72;\n  4:      1098,      2506,       1902,        480;\n  5:      9846,     30718,      35868,      18576,       3600;\n  6:     96408,    383588,     609483,     483376,     191340,      30240;\n  7:   1028952,   4994820,   10088403,   10851536,    6555820,    2109024,     282240;\n  8:  11922480,  68469336,  168314100,  229576196,  187637980,   91893096,   24967152,   2903040;\n  9: 149291280, 991612296, 2878495140, 4769526156, 4933720230, 3262479816, 1346724792, 317272320, 32659200;\n","recurrence_sentence":"The row polynomials satisfy n*P(n,x) = -(n^3+3*n^2+3*n+1+(2*n^3+4*n^2+2*n)*x+(n^3+n^2)*x^2)*P(n-2,x) + (2*n^2+4*n+1+(2*n^2+2*n)*x)*P(n-1,x) for n >= 2, with P(0,x) = 0, P(1,x) = 2.","mathematica":"P[0, x_] := 0;\nP[1, x_] := 2;\nP[n_, x_] := P[n, x] = Expand[Together[(-(n^3 + 3*n^2 + 3*n + 1 + (2*n^3 + 4*n^2 + 2*n)*x + (n^3 + n^2)*x^2)*P[n - 2, x] + (2*n^2 + 4*n + 1 + (2*n^2 + 2*n)*x)*P[n - 1, x])/(n)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 0; v[2] = 2; for(n = 2, N, my(i = n + 1); v[i] = (-(n^3 + 3*n^2 + 3*n + 1 + (2*n^3 + 4*n^2 + 2*n)*x + (n^3 + n^2)*x^2)*v[i - 2] + (2*n^2 + 4*n + 1 + (2*n^2 + 2*n)*x)*v[i - 1])/(n)); 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-2feb6dc01f424b0a","steps":["basis A007318","D"],"edges":["e-5281dccfa5f22cf2","e-33b1e0e2910065ef"],"text":"A145324 \u2192 basis A007318 \u2192 D"},"headline":"A145324 \u2192 basis A007318 \u2192 D","chain":null}