A028326 → basis A013610 → basis A013609

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Submission text ?

Triangle begins:
  0:       2;
  1:      10,       12;
  2:      50,      120,        72;
  3:     250,      900,      1080,       432;
  4:    1250,     6000,     10800,      8640,       2592;
  5:    6250,    37500,     90000,    108000,      64800,      15552;
  6:   31250,   225000,    675000,   1080000,     972000,     466560,     93312;
  7:  156250,  1312500,   4725000,   9450000,   11340000,    8164800,   3265920,    559872;
  8:  781250,  7500000,  31500000,  75600000,  113400000,  108864000,  65318400,  22394880,   3359232;
  9: 3906250, 42187500, 202500000, 567000000, 1020600000, 1224720000, 979776000, 503884800, 151165440, 20155392;

The row polynomials satisfy P(n,x) = (5+6*x)*P(n-1,x) for n >= 1, with P(0,x) = 2.

P[0, x_] := 2;
P[n_, x_] := P[n, x] = Expand[(5 + 6*x)*P[n - 1, x]];
Table[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten

P(N) = {my(v = vector(N + 1)); v[1] = 2; for(n = 1, N, my(i = n + 1); v[i] = (5 + 6*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 Twice Pascal's triangle A007318: T(n,k) = 2*C(n,k).?
    • Geometric basis map (elementary) polytool ? step ›

      • from Twice Pascal's triangle A007318: T(n,k) = 2*C(n,k).?
        • Liu–Wang theorem [LW07, Thm 2.1, Cor 2.4] ? step › direct check
        • 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
        • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

          • from Twice Pascal's triangle A007318: T(n,k) = 2*C(n,k).?
            • ↑ Liu–Wang theorem (above)
            • ↑ Row-hypergeometric rows (multiplier sequences) (above)
            • Parent-row provers of polytool polytool ? 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 (above)
        • ↑ Iterated real-rootedness preservers (above)
    • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

      • from shift_x_plus_one of Twice Pascal's triangle A007318: T(n,k) = 2*C(n,k).?
        • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

          • from Twice Pascal's triangle A007318: T(n,k) = 2*C(n,k).?
            • ↑ Liu–Wang theorem (above)
            • ↑ Row-hypergeometric rows (multiplier sequences) (above)
            • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
            • ↑ Parent-row provers of polytool (above)
            • ↑ Iterated real-rootedness preservers (above)
        • Geometric basis map (elementary) polytool ? step ›

          • from Twice Pascal's triangle A007318: T(n,k) = 2*C(n,k).?
            • ↑ Liu–Wang theorem (above)
            • ↑ Row-hypergeometric rows (multiplier sequences) (above)
            • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
            • ↑ Parent-row provers of polytool (above)
            • ↑ Iterated real-rootedness preservers (above)

Related ?

Same fingerprint ?

• A038220 → basis A013610 → D
• A178820 → basis A013610 → basis A013609
• A038271 → basis A013609 → D
• A156992 → basis A013610 → basis A013609
• A196347 → basis A013610 → basis A013609
• A038338 → basis A013610 → basis A013609
• A013612 → x ↦ x+1
• A178822 → basis A013610 → basis A013609
• Triangle whose (i,j)-th entry is binomial(i,j)*10^(i-j)*12^j.
• A038271 → basis A013609
• A038334 → basis A013610 → reverse
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*10^j.
• A038334 → basis A013610
• A013612 → x ↦ x+1 → D
• A178821 → basis A013610 → basis A013609
• A038255 → basis A013610 → basis A013611
• A013612 → x ↦ x+1 → reverse
• A038259 → D
• A038314 → D
• A038336 → D
• A038291 → basis A013609 → x ↦ x/(x+1)
• A120910 → basis A013609 → basis A013610
• A038259: Triangle whose (i,j)-th entry is binomial(i,j)*6^(i-j)*5^j.
• A038220 → basis A013610
• A038221 → basis A013610 → basis A013609
• A038329 → x ↦ x+1 → x ↦ x/(x+1)
• A038334 → basis A013610 → D
• A147716 → basis A013610 → x ↦ x/(x+1)
• A085880 → basis A013610 → basis A013609

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.