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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":"050e02f18e74c5c3ee2b3c04e11b572c1f29b24114def295f655c0e4f5ab76eb","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-f4f909be2b0f8048","role":"sequence","name":"basis_map_A013611 of Triangle of polynomial coefficients related to the series expansions of (1-x)^((-1-2*n)/2).","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,          16;\n   3:        15,         128,         192;\n   4:       105,        1136,        2880,         2048;\n   5:       945,       11904,       39552,        49152,        20480;\n   6:     10395,      146064,      577920,       962560,       716800,       196608;\n   7:    135135,     2065152,     9265728,     18677760,     18944000,      9437184,      1835008;\n   8:   2027025,    33139440,   163767744,    379000832,    470937600,    323420160,    115605504,    16777216;\n   9:  34459425,   595802880,  3181724928,   8189870080,  11795947520,  10019143680,   4983881728,  1342177280,   150994944;\n  10: 654729075, 11871605520, 67602408192, 189545930752, 306021703680, 303604826112, 188205760512, 71068286976, 14948499456, 1342177280;\n","recurrence_sentence":"The row polynomials satisfy P(n,x) = -(4*n^2-12*n+9+(32*n-48)*x+64*x^2)*P(n-2,x) + (4*n-4+16*x)*P(n-1,x) for n >= 3, with P(1,x) = 1, P(2,x) = 3 + 16*x.","mathematica":"P[1, x_] := 1;\nP[2, x_] := 3 + 16*x;\nP[n_, x_] := P[n, x] = Expand[-(4*n^2 - 12*n + 9 + (32*n - 48)*x + 64*x^2)*P[n - 2, x] + (4*n - 4 + 16*x)*P[n - 1, x]];\nTable[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten","pari":"P(N) = {my(v = vector(N)); v[1] = 1; v[2] = 3 + 16*x; for(n = 3, N, my(i = n); v[i] = -(4*n^2 - 12*n + 9 + (32*n - 48)*x + 64*x^2)*v[i - 2] + (4*n - 4 + 16*x)*v[i - 1]); 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-7c9c430277778c10","steps":["basis A013611","\u03b8+1"],"edges":["e-1182ea8561b370d4","e-5b194e15e0d20ca7"],"text":"A161198 \u2192 basis A013611 \u2192 \u03b8+1"},"headline":"A161198 \u2192 basis A013611 \u2192 \u03b8+1","chain":null}