A120910 → basis A013610 → basis A013610

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Submission text ?

Triangle begins:
  0:        3;
  1:       18,        27;
  2:      108,       324,        243;
  3:      648,      2916,       4374,       2187;
  4:     3888,     23328,      52488,      52488,       19683;
  5:    23328,    174960,     524880,     787320,      590490,      177147;
  6:   139968,   1259712,    4723920,    9447840,    10628820,     6377292,     1594323;
  7:   839808,   8817984,   39680928,   99202320,   148803480,   133923132,    66961566,    14348907;
  8:  5038848,  60466176,  317447424,  952342272,  1785641760,  2142770112,  1607077584,   688747536,  129140163;
  9: 30233088, 408146688, 2448880128, 8571080448, 19284931008, 28927396512, 28927396512, 18596183472, 6973568802, 1162261467;

The row polynomials satisfy P(n,x) = (6+9*x)*P(n-1,x) for n >= 1, with P(0,x) = 3.

P[0, x_] := 3;
P[n_, x_] := P[n, x] = Expand[(6 + 9*x)*P[n - 1, x]];
Table[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten

P(N) = {my(v = vector(N + 1)); v[1] = 3; for(n = 1, N, my(i = n + 1); v[i] = (6 + 9*x)*v[i - 1]); v};
row(n, p) = {my(c = Vecrev(p)); c};
T(N) = {my(v = P(N)); concat(vector(#v, i, row(i - 1, v[i])))};
T(9)

Properties

• Real-rooted? Every row P_n, n ≥ 0, is zero or real-rooted with all roots in (−∞, 0]
  by Geometric basis map (elementary)
• Coefficients of one sign? Every nonzero row, n ≥ 0: the coefficients of P_n have one sign
  derived from Geometric basis map (elementary)
• Hadamard kernel (Malo)? Rows P_n, n ≥ 0, are Hadamard kernels (preserve real-rootedness)
  derived from Geometric basis map (elementary)

Proof chains ? JSON

• Geometric basis map (elementary) polytool ? step ›

  • from basis_map_A013610 of Triangle read by rows: T(n,k) is the number of ternary words of length n having k levels (n >= 1, …?
    • Geometric basis map (elementary) polytool ? step ›

      • from Triangle read by rows: T(n,k) is the number of ternary words of length n having k levels (n >= 1, 0 <= k <= n-1). A lev…?
        • Row-hypergeometric rows (multiplier sequences) [SP14; Bra15, Thm 7.1 of arXiv:1410.6601] polytool RealRooted RealRooted.isPFMultiplierSequence_eval_of_roots_nonpos RealRooted RealRooted.isPFMultiplierSequence_inv_ascPochhammer RealRooted RealRooted.IsPFMultiplierSequence.mul ? step › direct check
        • Liu–Wang theorem [LW07, Thm 2.1, Cor 2.4] ? step › direct check
        • Iterated real-rootedness preservers [SP14; Bra15, Thm 7.1 of arXiv:1410.6601; Bra06, Cor 3.5] polytool ? step › direct check
        • Parent-row provers of polytool polytool ? step › direct check
        • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

          • from Triangle read by rows: T(n,k) is the number of ternary words of length n having k runs (i.e., subwords of maximal lengt…?
            • Row-hypergeometric rows (multiplier sequences) [SP14; Bra15, Thm 7.1 of arXiv:1410.6601] polytool RealRooted RealRooted.isPFMultiplierSequence_eval_of_roots_nonpos RealRooted RealRooted.isPFMultiplierSequence_inv_ascPochhammer RealRooted RealRooted.IsPFMultiplierSequence.mul ? step › direct check
            • Liu–Wang theorem [LW07, Thm 2.1, Cor 2.4] ? step › direct check
            • Iterated real-rootedness preservers [SP14; Bra15, Thm 7.1 of arXiv:1410.6601; Bra06, Cor 3.5] polytool ? step › direct check
            • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

              • from Triangle read by rows: T(n,k) is the number of ternary words of length n having k levels (n >= 1, 0 <= k <= n-1). A lev…?
                • ↑ Row-hypergeometric rows (multiplier sequences) (above)
                • ↑ Liu–Wang theorem (above)
                • ↑ Iterated real-rootedness preservers (above)
                • ↑ Parent-row provers of polytool (above)
            • Parent-row provers of polytool polytool ? step › direct check
    • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

      • from basis_map_A013610 of Triangle read by rows: T(n,k) is the number of ternary words of length n having k levels (n >= 1, …?
        • ↑ Geometric basis map (elementary) (above)

Related ?

Same fingerprint ?

• A085880 → basis A013611 → x ↦ x+1
• A156992 → basis A007318 → basis A013609
• A003506 → x ↦ x+1 → basis A013609
• A038221 → basis A013609 → basis A013610
• basis-map coefficients of A112227 → basis A013610 → basis A013609
• basis-map coefficients of A112227 → x ↦ x+1 → basis A013610
• A178822 → basis A013609 → basis A013610
• A028326 → basis A013610 → D
• A120910 → x ↦ x/(x+1)
• A120910 → basis A013609
• A038334 → D
• A178821 → basis A013610
• A156992 → basis A013609 → basis A013610
• A136572 → basis A013610 → basis A013609
• A356546 → basis A013611 → basis A007318
• A038334 → reverse
• A013610 → D → basis A013609
• A013620 → D
• A196347 → basis A013611 → x ↦ x+1
• A178822 → basis A013611 → basis A007318
• A038325 → basis A013609 → basis A013610
• basis-map coefficients of A026729, shifted → basis A007318 → basis A013610
• basis-map coefficients of A030528, shifted → basis A013609 → x ↦ x+1
• A196347 → basis A013610
• A134058 → basis A013610
• A038208 → D → basis A013610
• A135065 → x ↦ x+1 → basis A013609
• A038220: Triangle whose (i,j)-th entry is binomial(i,j)*3^(i-j)*2^j.
• basis-map coefficients of A112227 → basis A013609 → x ↦ x+1
• basis-map coefficients of A026729 → basis A013609 → x ↦ x+1
• A196347 → basis A013610 → D
• A156992 → basis A013611 → x ↦ x+1
• A038330 → basis A013609 → basis A013609
• A134059 → basis A013610
• A178822 → basis A013610
• basis-map coefficients of A026729 → basis A013610 → basis A013609
• A135089 → basis A013610
• basis-map coefficients of A026729, shifted → basis A013609 → basis A007318
• A038220 → D
• A344565 → basis A013610
• A028326 → D → basis A013610
• A156992 → basis A013610 → D
• A013620: Triangle of coefficients in expansion of (2+3x)^n.
• A038221 → basis A013610 → D
• A136572 → basis A013609 → x ↦ x+1
• A085881 → basis A013610
• A356546 → x ↦ x+1 → basis A013609
• A178821 → basis A013611 → basis A007318
• A094305 → x ↦ x+1 → basis A013609
• basis-map coefficients of A030528, shifted → basis A013610 → basis A013609
• A178821 → basis A013610 → reverse
• A038243 → basis A013611 → D
• A085881 → basis A007318 → basis A013609
• A376827 → basis A013610
• A085880 → basis A013610
• A038221 → basis A013611 → x ↦ x+1
• A085880 → basis A013610 → D
• A178822 → x ↦ x+1 → basis A013609
• basis-map coefficients of A026729 → basis A007318 → basis A013610
• A013609 → basis A013610 → x ↦ x+1
• A178821 → basis A013610 → D
• A094305 → basis A013610
• A028326 → basis A007318 → basis A013609
• basis-map coefficients of A113214, shifted → D → basis A013610
• A038330 → basis A013609 → x ↦ x/(x+1)
• A135065 → x ↦ x+1 → x ↦ x/(x+1)
• A178822 → basis A013610 → D
• A038291 → basis A013609 → basis A013611
• A038338 → basis A013610
• A085880 → basis A013610 → reverse
• A038325 → basis A013610
• A134346 → basis A013610
• A085881 → basis A013609 → basis A013610
• A085881 → basis A013611 → basis A007318
• A156992 → basis A013610
• A178820 → basis A013609 → basis A013610
• A038338 → basis A013610 → D
• A120910 → basis A013609 → reverse
• A038330 → basis A013611 → basis A013610
• A135065 → basis A013610
• A094305 → x ↦ x+1 → x ↦ x/(x+1)
• A135838 → basis A013610
• A356546 → basis A013609 → basis A013610
• A028326 → basis A013610
• basis-map coefficients of A113214, shifted → basis A013610
• A028326 → basis A013611 → x ↦ x+1
• A038338 → basis A013610 → reverse
• A178820 → basis A007318 → basis A013609
• A216973 → basis A013610
• A120910 → D → basis A013609
• A178820 → basis A013610
• A178820 → basis A013610 → D
• A038208 → basis A013610
• A038243 → basis A013611
• A258758 → basis A013610
• A038221 → basis A013610
• basis-map coefficients of A026729, shifted → basis A013610 → basis A013609
• A131431 → x ↦ x+1 → basis A013610
• A027466 → basis A013611 → x ↦ x/(x+1)
• A085880 → D → basis A013610
• A038338 → basis A013609 → basis A013610
• A124860 → basis A013610
• A013610 → basis A013611 → basis A013609
• A356546 → basis A013610
• A120909 → basis A013610 → x ↦ x+1
• A027465 → basis A013611 → basis A013610
• A085880 → basis A013609 → basis A013610
• A132200 → basis A013610
• basis-map coefficients of A127647 → basis A013610
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*8^j.
• A038325 → basis A007318 → basis A013609
• A178821 → basis A013609 → basis A013610
• A120910 → basis A013609 → D
• A028326 → basis A013609 → basis A013610
• A038328 → basis A013609 → basis A013610
• A038208 → basis A013610 → D
• A003506 → D → basis A013610
• A178820 → basis A013611 → basis A007318

References

1. [Bra06] Petter Brändén. On linear transformations preserving the Pólya frequency property. Transactions of the American Mathematical Society, 358(8):3697–3716, February 2006. doi:10.1090/s0002-9947-06-03856-6
2. [Bra15] Petter Brändén. Unimodality, log-concavity, real-rootedness and beyond. Handbook of enumerative combinatorics, :437–483, March 2015. doi:10.1201/b18255-10
3. [LW07] Lily L. Liu and Yi Wang. A unified approach to polynomial sequences with only real zeros. Advances in Applied Mathematics, 38(4):542–560, May 2007. doi:10.1016/j.aam.2006.02.003
4. [SP14] J Schur and G Polya. Über zwei Arten von Faktorenfolgen in der Theorie der algebraischen Gleichungen. J. Reine Angew. Math., 1914.