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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":"8f0c762e21bb639c077644ab765cf584940b99f7ca15e423adffe6c0abad1a34","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-8348c590b954589f","role":"sequence","name":"one_plus_derivative of Triangle read by rows: T(n,k) = (k+1)^2*binomial(n,k) (0 <= k <= n).","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:   4;\n  2:  26,   18;\n  3:  66,  150,    48;\n  4: 124,  492,   492,    100;\n  5: 200, 1140,  1980,   1220,    180;\n  6: 294, 2190,  5460,   5820,   2550,    294;\n  7: 406, 3738, 12180,  18620,  14070,   4746,   448;\n  8: 536, 5880, 23688,  47320,  51240,  29736,  8120,   648;\n  9: 684, 8712, 41832, 103320, 146160, 121464, 56952, 13032, 900;\n","recurrence_sentence":"The row polynomials satisfy P(n,x) = (1+5*x+10*x^2+10*x^3+5*x^4+x^5)*P(n-5,x) - (5+20*x+30*x^2+20*x^3+5*x^4)*P(n-4,x) + (10+30*x+30*x^2+10*x^3)*P(n-3,x) - (10+20*x+10*x^2)*P(n-2,x) + (5+5*x)*P(n-1,x) for n >= 5, with P(0,x) = 0, P(1,x) = 4, P(2,x) = 26 + 18*x, P(3,x) = 66 + 150*x + 48*x^2, P(4,x) = 124 + 492*x + 492*x^2 + 100*x^3.","mathematica":"P[0, x_] := 0;\nP[1, x_] := 4;\nP[2, x_] := 26 + 18*x;\nP[3, x_] := 66 + 150*x + 48*x^2;\nP[4, x_] := 124 + 492*x + 492*x^2 + 100*x^3;\nP[n_, x_] := P[n, x] = Expand[(1 + 5*x + 10*x^2 + 10*x^3 + 5*x^4 + x^5)*P[n - 5, x] - (5 + 20*x + 30*x^2 + 20*x^3 + 5*x^4)*P[n - 4, x] + (10 + 30*x + 30*x^2 + 10*x^3)*P[n - 3, x] - (10 + 20*x + 10*x^2)*P[n - 2, x] + (5 + 5*x)*P[n - 1, x]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 0; v[2] = 4; v[3] = 26 + 18*x; v[4] = 66 + 150*x + 48*x^2; v[5] = 124 + 492*x + 492*x^2 + 100*x^3; for(n = 5, N, my(i = n + 1); v[i] = (1 + 5*x + 10*x^2 + 10*x^3 + 5*x^4 + x^5)*v[i - 5] - (5 + 20*x + 30*x^2 + 20*x^3 + 5*x^4)*v[i - 4] + (10 + 30*x + 30*x^2 + 10*x^3)*v[i - 3] - (10 + 20*x + 10*x^2)*v[i - 2] + (5 + 5*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 - 1, v[i])))};\nT(9)","reading":{"first_row":0,"offset":0,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-e7d0ffa461d9dbc4","steps":["D+1","D"],"edges":["e-720363525db6d149","e-3ded5cbe3c5cecf6"],"text":"A125092 \u2192 D+1 \u2192 D"},"headline":"A125092 \u2192 D+1 \u2192 D","chain":null}