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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":"67756bd144113c44f158f522225032d52693c089825efa57a4b031c3a9c42034","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-b11b90d367f09b77","role":"sequence","name":"basis_map_A013609 of Triangle read by rows: T(n,k) are the coefficients of Charlier polynomials: A046716 transposed, for 0 <= k <= n.","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:      2,        8;\n   3:      5,       40,        36;\n   4:     16,      184,       324,       128;\n   5:     65,      928,      2340,      1792,       400;\n   6:    326,     5352,     16920,     18560,      8000,      1152;\n   7:   1957,    35432,    130824,    181120,    112000,     31104,     3136;\n   8:  13700,   267000,   1104516,   1802752,   1414000,    564480,   109760,     8192;\n   9: 109601,  2264576,  10226376,  18884096,  17575600,   8934912,  2502528,   360448,   20736;\n  10: 986410, 21386568, 103618224, 210779392, 223456800, 135451008, 48470016, 10076160, 1119744, 51200;\n","recurrence_sentence":"The row polynomials satisfy P(n,x) = -(n^2-7*n+12)*P(n-4,x) + (2*n^2-9*n+9+(8*n-24)*x)*P(n-3,x) - (8*n-24)*x^2*d/dx P(n-3,x) - (n^2-4+(8*n-8)*x-36*x^2)*P(n-2,x) + ((8*n-8)*x^2+16*x^3)*d/dx P(n-2,x) + (2*n-1+8*x)*P(n-1,x) - 8*x^2*d/dx P(n-1,x) for n >= 5, with P(1,x) = 1, P(2,x) = 2 + 8*x, P(3,x) = 5 + 40*x + 36*x^2, P(4,x) = 16 + 184*x + 324*x^2 + 128*x^3.","mathematica":"P[1, x_] := 1;\nP[2, x_] := 2 + 8*x;\nP[3, x_] := 5 + 40*x + 36*x^2;\nP[4, x_] := 16 + 184*x + 324*x^2 + 128*x^3;\nP[n_, x_] := P[n, x] = Expand[-(n^2 - 7*n + 12)*P[n - 4, x] + (2*n^2 - 9*n + 9 + (8*n - 24)*x)*P[n - 3, x] - (8*n - 24)*x^2*D[P[n - 3, x], x] - (n^2 - 4 + (8*n - 8)*x - 36*x^2)*P[n - 2, x] + ((8*n - 8)*x^2 + 16*x^3)*D[P[n - 2, x], x] + (2*n - 1 + 8*x)*P[n - 1, x] - 8*x^2*D[P[n - 1, x], x]];\nTable[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten","pari":"P(N) = {my(v = vector(N)); v[1] = 1; v[2] = 2 + 8*x; v[3] = 5 + 40*x + 36*x^2; v[4] = 16 + 184*x + 324*x^2 + 128*x^3; for(n = 5, N, my(i = n); v[i] = -(n^2 - 7*n + 12)*v[i - 4] + (2*n^2 - 9*n + 9 + (8*n - 24)*x)*v[i - 3] - (8*n - 24)*x^2*deriv(v[i - 3], x) - (n^2 - 4 + (8*n - 8)*x - 36*x^2)*v[i - 2] + ((8*n - 8)*x^2 + 16*x^3)*deriv(v[i - 2], x) + (2*n - 1 + 8*x)*v[i - 1] - 8*x^2*deriv(v[i - 1], x)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};\nT(10)","reading":{"first_row":1,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-3272d5bc697b9cb4","steps":["basis A013609","(\u03b8+1)\u00b2"],"edges":["e-9a46600ceb40809a","e-b7a19bb559550741"],"text":"A094816 \u2192 basis A013609 \u2192 (\u03b8+1)\u00b2"},"headline":"A094816 \u2192 basis A013609 \u2192 (\u03b8+1)\u00b2","chain":null}