basis-map coefficients of A112227 → basis A013609 → basis A013610

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Submission text ?

Triangle begins:
   1:      9,      36,       36;
   2:     27,     162,      324,       216;
   3:     81,     648,     1944,      2592,      1296;
   4:    243,    2430,     9720,     19440,     19440,       7776;
   5:    729,    8748,    43740,    116640,    174960,     139968,      46656;
   6:   2187,   30618,   183708,    612360,   1224720,    1469664,     979776,     279936;
   7:   6561,  104976,   734832,   2939328,   7348320,   11757312,   11757312,    6718464,    1679616;
   8:  19683,  354294,  2834352,  13226976,  39680928,   79361856,  105815808,   90699264,   45349632,   10077696;
   9:  59049, 1180980, 10628820,  56687040, 198404640,  476171136,  793618560,  906992640,  680244480,  302330880,   60466176;
  10: 177147, 3897234, 38972340, 233834040, 935336160, 2618941248, 5237882496, 7482689280, 7482689280, 4988459520, 1995383808, 362797056;

The row polynomials satisfy P(n,x) = (3+6*x)*P(n-1,x) for n >= 2, with P(1,x) = 9 + 36*x + 36*x^2.

P[1, x_] := 9 + 36*x + 36*x^2;
P[n_, x_] := P[n, x] = Expand[(3 + 6*x)*P[n - 1, x]];
Table[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten

P(N) = {my(v = vector(N)); v[1] = 9 + 36*x + 36*x^2; for(n = 2, N, my(i = n); v[i] = (3 + 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, v[i])))};
T(10)

Properties

• Real-rooted? Every row P_n, n ≥ 1, is zero or real-rooted with all roots in (−∞, 0]
  by Geometric basis map (elementary)
• Coefficients of one sign? Every nonzero row, n ≥ 1: the coefficients of P_n have one sign
  derived from Geometric basis map (elementary)
• Hadamard kernel (Malo)? Rows P_n, n ≥ 1, are Hadamard kernels (preserve real-rootedness)
  derived from Geometric basis map (elementary)

Proof chains ? JSON

• Geometric basis map (elementary) polytool ? step ›

  • from basis_map_A013609 of basis-map coefficients of A scaled Hermite triangle.?
    • Geometric basis map (elementary) polytool ? step ›

      • from basis-map coefficients of A scaled Hermite triangle.?
        • 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
        • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

          • from basis-map coefficients of A scaled Hermite triangle.?
            • ↑ 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 basis-map coefficients of A scaled Hermite triangle.?
        • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

          • from basis-map coefficients of A scaled Hermite triangle.?
            • ↑ Parent-row provers of polytool (above)
            • ↑ Iterated real-rootedness preservers (above)
            • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
        • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

          • from shift_x_plus_one of basis-map coefficients of A scaled Hermite triangle.?
            • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
            • Geometric basis map (elementary) polytool ? step ›

              • from basis-map coefficients of A scaled Hermite triangle.?
                • ↑ Parent-row provers of polytool (above)
                • ↑ Iterated real-rootedness preservers (above)
                • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
        • ↑ Geometric basis map (elementary) (above)

Related ?

Same fingerprint ?

• A376827 → x ↦ x/(x+1)
• basis-map coefficients of A113214, shifted → D → basis A013611
• A028326 → basis A007318
• A094305 → x ↦ x+1 → D
• A178821 → basis A013611 → basis A013610
• Veronese parent of A098172 → x ↦ x/(x+1)
• A013609 → basis A013610
• A135065 → basis A013611
• basis-map coefficients of A112227 → basis A013609
• A085881 → x ↦ x/(x+1)
• A178822 → basis A013611 → D
• basis-map coefficients of A030528, shifted → (θ+1)² → basis A013609
• A178820 → basis A013611 → basis A013610
• A134059 → basis A007318
• A178822 → x ↦ x+1 → reverse
• A038221 → basis A013611 → basis A013610
• A027466 → basis A013611
• basis-map coefficients of A113214, shifted → x ↦ x/(x+1)
• A038330 → basis A013611 → x ↦ x/(x+1)
• basis-map coefficients of A030528, shifted → basis A013609 → basis A013610
• basis-map coefficients of A112227 → x ↦ x+1 → basis A013611
• A085880 → x ↦ x/(x+1)
• A135838 → x ↦ x/(x+1)
• basis-map coefficients of A026729 → basis A013609 → D
• A038208 → basis A007318
• A085880 → x ↦ x+1 → reverse
• A136572 → basis A013609
• A216973 → basis A013611
• A136572 → basis A013609 → basis A013610
• A028326 → basis A007318 → reverse
• basis-map coefficients of A113214, shifted → D → basis A007318
• Veronese parent of A098172 → x ↦ x/(x+1)
• A135089 → basis A007318
• A003506 → D → x ↦ x+1
• A085881 → basis A013611 → basis A013610
• A196347 → basis A013611 → basis A013610
• A344565 → basis A007318
• A376827 → basis A013611
• A038338 → x ↦ x+1
• basis-map coefficients of A026729, shifted → basis A007318 → basis A013611
• A038338 → x ↦ x+1 → D
• A028326 → basis A013609 → x ↦ x+1
• basis-map coefficients of A021012 → basis A013609
• A376827 → basis A007318
• A132200 → basis A007318
• A028326 → basis A007318 → D
• A130123 → D → basis A013609
• A038207: Triangle whose (i,j)-th entry is binomial(i,j)*2^(i-j).
• A038221 → basis A013611
• A178820 → basis A007318 → reverse
• A120909 → basis A013610 → reverse
• A003506 → x ↦ x+1
• A132440 → basis A013609
• A135838 → basis A013611
• A038208 → basis A007318 → D
• A131431 → x ↦ x+1 → x ↦ x/(x+1)
• A156992 → basis A013611
• A085881 → basis A013611 → D
• A013609 → D → D
• A178822 → x ↦ x+1
• A159854 → x ↦ x/(x+1)
• basis-map coefficients of A021012 → θ+1 → basis A013609
• A135065 → x ↦ x/(x+1)
• A085880 → x ↦ x+1
• A038208 → x ↦ x/(x+1)
• A136572 → θ+1 → basis A013609
• image under θ+1 → basis A013609
• A013609 → D
• A356546 → basis A013611
• A178822 → basis A013609 → basis A013611
• A131431 → D → basis A013609
• A135838 → x ↦ x+1
• A196347 → basis A013609 → basis A007318
• A085880 → basis A013611 → basis A013610
• A120909 → basis A013610 → D
• A135089 → basis A013611
• A085881 → basis A013611
• basis-map coefficients of A113214, shifted → basis A013609 → x ↦ x+1
• A135065 → x ↦ x+1 → D
• A134059 → basis A013611
• basis-map coefficients of A112227 → θ+1 → basis A013609
• A038338 → x ↦ x+1 → reverse
• A156992 → x ↦ x/(x+1)
• A038208 → D → basis A013611
• A038329 → x ↦ x+1 → basis A013610
• A085880 → basis A013611
• A120910 → D
• A085880 → D → basis A013611
• A038325 → basis A013611
• A038338 → basis A013609 → basis A007318
• A085881 → basis A007318 → D
• A085880 → basis A013609 → x ↦ x+1
• A136572 → basis A013609 → D
• A038330 → basis A013611 → basis A007318
• A196347 → x ↦ x+1
• A178822 → basis A013609 → x ↦ x+1
• A131431 → basis A013609
• A027466 → basis A013611 → D
• A038221 → basis A013609 → basis A013611
• A124860 → basis A013611
• A038221 → basis A013611 → D
• A028326 → basis A013609 → basis A013611
• A178820 → basis A013611 → D
• A344565 → x ↦ x/(x+1)
• A356546 → x ↦ x+1 → reverse
• A028326 → basis A013611 → basis A013610
• A007318 → ×(−(1/2)n+(1/2)n²) → x ↦ x/(x+1)
• A178821 → basis A007318 → reverse
• A094305 → basis A013611
• A134058 → basis A013611
• A178821 → basis A013611 → D
• A356546 → x ↦ x/(x+1)
• basis-map coefficients of A112227 → x ↦ x+1 → basis A007318
• A124860 → x ↦ x+1
• A156992 → basis A013611 → D
• A196347 → basis A013611
• A136572 → D → basis A013609
• basis-map coefficients of A026729 → basis A007318 → basis A013611
• A038325 → basis A007318 → reverse
• A258758 → basis A013611
• basis-map coefficients of A030528, shifted → basis A013609
• image under θ+1 → (θ+1)² → basis A013609
• A356546 → x ↦ x+1 → D
• A178820 → x ↦ x/(x+1)
• A178821 → basis A013611
• A038330 → basis A013609
• A038208 → basis A013611 → D
• A003506 → x ↦ x/(x+1)
• A003506 → D → basis A013611
• A136521 → basis A013609
• A134309 → basis A013609
• A085880 → basis A013611 → D
• A356546 → basis A013609 → basis A013611
• A120910 → basis A007318 → basis A013609
• A178822 → x ↦ x/(x+1)
• A129186 → basis A013609
• A038221 → x ↦ x+1
• A178820 → basis A013611 → reverse
• A135065 → x ↦ x+1 → reverse
• basis-map coefficients of A030528, shifted → θ+1 → basis A013609
• A131431 → x ↦ x+1 → basis A013611
• A196347 → x ↦ x+1 → D
• A085881 → basis A007318 → reverse
• basis-map coefficients of A026729, shifted → basis A013609 → D
• basis-map coefficients of A026729, shifted → basis A013609
• A131431 → θ+1 → basis A013609
• A007318 → ×(−(1/2)n+(1/2)n²) → x ↦ x+1
• A038208 → basis A013611
• basis-map coefficients of A112227 → basis A013609 → D
• A178822 → x ↦ x+1 → D
• A094305 → x ↦ x/(x+1)
• basis-map coefficients of A026729, shifted → basis A007318 → x ↦ x+1
• A356546 → basis A013611 → reverse
• A156992 → basis A013611 → basis A013610
• A013609 → D → basis A013610
• A147716 → basis A013610 → basis A013610
• A038221 → x ↦ x+1 → D
• A085881 → basis A013611 → reverse
• A156992 → basis A013609 → basis A007318
• basis-map coefficients of A026729, shifted → (θ+1)² → basis A013609
• A134346 → x ↦ x+1
• A356546 → basis A013611 → D
• A085880 → D → basis A007318
• A131431 → x ↦ x+1 → basis A007318
• A120909 → basis A013610
• A013609: Triangle of coefficients in expansion of (1+2*x)^n.
• A038325 → basis A013609 → basis A007318
• A178821 → basis A013609 → basis A013611
• A085881 → basis A007318
• basis-map coefficients of A026729, shifted → basis A013609 → basis A013610
• A178820 → basis A013611
• basis-map coefficients of A113214, shifted → basis A013611
• A130123 → θ+1 → basis A013609
• A038325 → basis A007318
• image under θ+1 → θ+1 → D → basis A013609
• A038338 → basis A013611
• A134346 → x ↦ x/(x+1)
• basis-map coefficients of A127647 → x ↦ x/(x+1)
• A344565 → basis A013611
• A132200 → basis A013611
• A038330 → basis A013609 → reverse
• A120909 → D
• A085880 → basis A013609 → basis A013611
• A120910 → D → D
• A178821 → basis A007318
• A132440 → θ+1 → basis A013609
• basis-map coefficients of A112227 → (θ+1)² → basis A013609
• A178820 → basis A007318 → D
• Veronese parent of A098172 → x ↦ x/(x+1)
• A028326 → x ↦ x/(x+1)
• A134058 → basis A007318
• A124860 → x ↦ x/(x+1)
• A136572 → (θ+1)² → basis A013609
• basis-map coefficients of A030528, shifted → D → basis A013609
• A094305 → x ↦ x+1 → reverse
• basis-map coefficients of A026729 → (θ+1)² → basis A013609
• A178821 → x ↦ x/(x+1)
• A013609 → basis A013610 → basis A013610
• A178822 → basis A013611 → basis A013610
• A196347 → basis A013611 → D
• A130123 → basis A013609
• A356546 → basis A013611 → basis A013610
• A094305 → x ↦ x+1
• A178821 → basis A013611 → reverse
• A178820 → basis A007318
• A028326 → basis A013611 → D
• basis-map coefficients of A113214, shifted → x ↦ x+1
• basis-map coefficients of A127647 → basis A007318
• A178822 → basis A013611
• basis-map coefficients of A026729 → basis A013609 → basis A013610
• A038330 → basis A013609 → D
• A120910 → basis A013610 → basis A013611
• A120910: Triangle read by rows: T(n,k) is the number of ternary words of length n having k levels (n >= 1, 0 <= k <= n-…
• A135065 → x ↦ x+1
• A038325 → basis A007318 → D
• A027465 → D → basis A013609
• A038338 → x ↦ x/(x+1)
• A028326 → basis A013611
• A178821 → basis A007318 → D
• basis-map coefficients of A026729, shifted → D → basis A013609
• A356546 → x ↦ x+1
• basis-map coefficients of A026729, shifted → θ+1 → basis A013609
• basis-map coefficients of A026729 → basis A013609 → reverse
• A258758 → basis A007318
• A178820 → basis A013609 → basis A013611
• A130123 → basis A013609 → D
• basis-map coefficients of A026729 → basis A013609
• basis-map coefficients of A030528, shifted → basis A013609 → D
• A127648 → D → basis A013609
• A120909: Triangle read by rows: T(n,k) is the number of ternary words of length n having k runs (i.e., subwords of maxi…
• A038291 → basis A013609 → basis A013610
• A027465 → basis A013611 → basis A013611
• basis-map coefficients of A127647 → basis A013611
• A120909 → basis A013610 → basis A013610
• basis-map coefficients of A113214, shifted → basis A013609 → basis A013611
• A013609 → basis A013610 → D
• A134346 → basis A013611
• basis-map coefficients of A026729 → D → basis A013609
• A156992 → basis A007318
• A038325 → x ↦ x/(x+1)
• A131436 → basis A013609
• A156992 → basis A007318 → D

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. [SP14] J Schur and G Polya. Über zwei Arten von Faktorenfolgen in der Theorie der algebraischen Gleichungen. J. Reine Angew. Math., 1914.