basis-map coefficients of A026729 → basis A013610 → basis A013611

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Submission text ?

Triangle begins:
   1:      1;
   2:      4,      12;
   3:     16,      96,      144;
   4:     64,     576,     1728,      1728;
   5:    256,    3072,    13824,     27648,      20736;
   6:   1024,   15360,    92160,    276480,     414720,     248832;
   7:   4096,   73728,   552960,   2211840,    4976640,    5971968,     2985984;
   8:  16384,  344064,  3096576,  15482880,   46448640,   83607552,    83607552,    35831808;
   9:  65536, 1572864, 16515072,  99090432,  371589120,  891813888,  1337720832,  1146617856,   429981696;
  10: 262144, 7077888, 84934656, 594542592, 2675441664, 8026324992, 16052649984, 20639121408, 15479341056, 5159780352;

The row polynomials satisfy P(n,x) = (4+12*x)*P(n-1,x) for n >= 2, with P(1,x) = 1.

P[1, x_] := 1;
P[n_, x_] := P[n, x] = Expand[(4 + 12*x)*P[n - 1, x]];
Table[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten

P(N) = {my(v = vector(N)); v[1] = 1; for(n = 2, N, my(i = n); v[i] = (4 + 12*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_A013610 of basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k …?
    • Geometric basis map (elementary) polytool ? step ›

      • from basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >= 0, read by downwar…?
        • 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 basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >= 0, read by downwar…?
            • ↑ Iterated real-rootedness preservers (above)
            • ↑ Parent-row provers of polytool (above)
    • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

      • from basis_map_A013609 of basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k …?
        • Geometric basis map (elementary) polytool ? step ›

          • from basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >= 0, read by downwar…?
            • ↑ Iterated real-rootedness preservers (above)
            • ↑ Parent-row provers of polytool (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 Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >…?
            • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

              • from basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >= 0, read by downwar…?
                • ↑ Iterated real-rootedness preservers (above)
                • ↑ Parent-row provers of polytool (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 Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >…?
                • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
                • Geometric basis map (elementary) polytool ? step ›

                  • from basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >= 0, read by downwar…?
                    • ↑ Iterated real-rootedness preservers (above)
                    • ↑ Parent-row provers of polytool (above)
                    • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
                • Affine, reversal and Möbius substitutions (elementary) polytool ? step ›

                  • from veronese parent of Triangle T(n,k) with diagonals T(n,n-k) = binomial(n,3k).?
                    • 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
                    • 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 veronese parent of Triangle T(n,k) with diagonals T(n,n-k) = binomial(n,3k).?
                    • 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
                    • 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 veronese parent of Triangle T(n,k) with diagonals T(n,n-k) = binomial(n,3k).?
                    • Iterated real-rootedness preservers [SP14; Bra15, Thm 7.1 of arXiv:1410.6601; Bra06, Cor 3.5] polytool ? 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
                    • Parent-row provers of polytool polytool ? step › direct check
            • ↑ Geometric basis map (elementary) (above)
            • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
            • ↑ Affine, reversal and Möbius substitutions (elementary) (above)
            • ↑ Affine, reversal and Möbius substitutions (elementary) (above)

Related ?

Same fingerprint ?

• A094305 → x ↦ x+1 → x ↦ x+1
• A130123 → basis A013610
• basis-map coefficients of A112227 → basis A013610 → D
• A038330 → D
• image under θ+1 → θ+1 → D → basis A013610
• basis-map coefficients of A021012 → basis A013610
• A028326 → basis A007318 → basis A007318
• A178822 → basis A013611 → x ↦ x/(x+1)
• basis-map coefficients of A112227 → basis A013610 → basis A013611
• basis-map coefficients of A030528, shifted → (θ+1)² → basis A013610
• A129186 → basis A013610
• basis-map coefficients of A026729, shifted → (θ+1)² → basis A013610
• A130123 → (θ+1)² → basis A013610
• A196347 → x ↦ x+1 → basis A007318
• A028326 → basis A013611 → x ↦ x/(x+1)
• basis-map coefficients of A030528, shifted → basis A013610 → basis A013611
• A356546 → basis A013611 → x ↦ x/(x+1)
• A136572 → basis A013610 → basis A013611
• A038279 → basis A013610 → reverse
• A136521 → basis A013610
• A132440 → θ+1 → basis A013610
• basis-map coefficients of A026729 → basis A013610 → D
• A131431 → θ+1 → basis A013610
• basis-map coefficients of A030528, shifted → basis A013610
• A013610: Triangle of coefficients in expansion of (1+3*x)^n.
• basis-map coefficients of A026729 → basis A013610
• A038279 → basis A013610 → D
• A131431 → basis A013610
• basis-map coefficients of A030528, shifted → θ+1 → basis A013610
• A038243 → basis A013609 → D
• basis-map coefficients of A026729, shifted → basis A013610 → reverse
• basis-map coefficients of A112227 → basis A013610
• A038221 → basis A013611 → x ↦ x/(x+1)
• image under θ+1 → (θ+1)² → basis A013610
• A013610 → basis A013611
• basis-map coefficients of A026729, shifted → θ+1 → basis A013610
• A013610 → basis A013611 → D
• A038330 → reverse
• A120909 → x ↦ x/(x+1)
• A085881 → basis A013611 → x ↦ x/(x+1)
• basis-map coefficients of A026729 → basis A013610 → reverse
• A027465: Cube of lower triangular normalized binomial matrix.
• A136572 → D → basis A013610
• A120910 → basis A007318 → reverse
• A135065 → x ↦ x+1 → basis A007318
• A178822 → x ↦ x+1 → x ↦ x+1
• A136572 → θ+1 → basis A013610
• A178821 → basis A007318 → x ↦ x+1
• A130123 → D → basis A013610
• A085881 → basis A007318 → basis A007318
• A120910 → basis A007318
• basis-map coefficients of A112227 → (θ+1)² → basis A013610
• A038243 → basis A013609
• A120909 → basis A013610 → x ↦ x/(x+1)
• A127648 → D → basis A013610
• A013610 → D → D
• basis-map coefficients of A026729, shifted → basis A013610 → D
• basis-map coefficients of A112227 → basis A013610 → reverse
• Triangle whose (i,j)-th entry is binomial(i,j)*12^(i-j)*4^j.
• A136572 → basis A013610 → D
• basis-map coefficients of A030528, shifted → basis A013610 → reverse
• A120910 → D → x ↦ x+1
• A013610 → basis A013611 → reverse
• basis-map coefficients of A112227 → θ+1 → basis A013610
• basis-map coefficients of A021012 → θ+1 → basis A013610
• A038330 → basis A013609 → x ↦ x+1
• basis-map coefficients of A026729, shifted → basis A013610 → basis A013611
• A085880 → x ↦ x+1 → x ↦ x+1
• A147716 → basis A013610 → basis A013609
• A038338 → x ↦ x+1 → basis A007318
• A130123 → θ+1 → basis A013610
• basis-map coefficients of A030528, shifted → D → basis A013610
• A178820 → basis A007318 → basis A007318
• A038329 → x ↦ x+1 → basis A013609
• A038279 → basis A013610
• A131436 → basis A013610
• A038325 → basis A007318 → basis A007318
• A130123 → basis A013610 → D
• A131431 → D → basis A013610
• A127648 → basis A013610
• basis-map coefficients of A026729 → D → basis A013610
• A085880 → basis A013611 → x ↦ x/(x+1)
• A156992 → basis A013611 → x ↦ x/(x+1)
• A027465 → D → D
• A013609 → basis A013610 → x ↦ x/(x+1)
• image under θ+1 → basis A013610
• A136572 → basis A013610
• A027465 → D
• A178821 → basis A013611 → x ↦ x/(x+1)
• basis-map coefficients of A030528, shifted → basis A013610 → D
• A196347 → basis A013611 → x ↦ x/(x+1)
• basis-map coefficients of A026729, shifted → basis A013610
• A356546 → x ↦ x+1 → x ↦ x+1
• A156992 → basis A007318 → x ↦ x+1
• A013610 → D
• A134309 → basis A013610
• basis-map coefficients of A026729 → (θ+1)² → basis A013610
• A136572 → (θ+1)² → basis A013610
• A178820 → basis A013611 → x ↦ x/(x+1)
• A013610 → D → basis A013611
• A130123 → basis A013610 → basis A013611
• basis-map coefficients of A026729, shifted → D → basis A013610

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.