basis-map coefficients of A021012 → D

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Triangle begins:
   1:  0;
   2: -1;
   3:  0, 4;
   4:  0, 0, -18;
   5:  0, 0,   0, 96;
   6:  0, 0,   0,  0, -600;
   7:  0, 0,   0,  0,    0, 4320;
   8:  0, 0,   0,  0,    0,    0, -35280;
   9:  0, 0,   0,  0,    0,    0,      0, 322560;
  10:  0, 0,   0,  0,    0,    0,      0,      0, -3265920;

The row polynomials satisfy (n-2)*P(n,x) = -(n^2-2*n+1)*x*P(n-1,x) for n >= 3, with P(1,x) = 0, P(2,x) = -1.

P[1, x_] := 0;
P[2, x_] := -1;
P[n_, x_] := P[n, x] = Expand[Together[(-(n^2 - 2*n + 1)*x*P[n - 1, x])/(n - 2)]];
Table[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten

P(N) = {my(v = vector(N)); v[1] = 0; v[2] = -1; for(n = 3, N, my(i = n); v[i] = (-(n^2 - 2*n + 1)*x*v[i - 1])/(n - 2)); 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)

Proved properties

• Real-rooted. Every row P_n, n >= 1, is zero or real-rooted with all roots in (-inf, 0]
  Every polynomial of the sequence has only real roots, inside the stated interval.
  by the cited steps: e-a4f18a96614f1aec
• Coefficients of one sign. Every nonzero row, n >= 1: the coefficients of P_n have one sign
  All coefficients of each polynomial have the same sign (after x -> -x when alternating).
  derived from the cited steps by a stated theorem: e-a4f18a96614f1aec
• Hadamard kernel (Malo). Rows P_n, n >= 1, are Hadamard kernels (preserve real-rootedness)
  Multiplying the coefficients of any real-rooted polynomial termwise by those of a row (Hadamard product) gives a real-rooted polynomial again.
  derived from the cited steps by a stated theorem: e-a4f18a96614f1aec

Proof chains

1 incoming proof step. Each step is expanded back to the roots of the proof DAG, the theorem checks of a node's own rule. JSON

• preserver_image derivative_polynomial, shift 0 e-a4f18a96614f1aec

  Laguerre’s theorem on differential operators [SP14] polytool ?

  • premise (sequence): basis-map coefficients of Triangle of coefficients in expansion of x^n in terms of Laguerre polynomials L_n(x).
    uses: Every row P_n, n >= 1, is zero or real-rooted with all roots in (-inf, 0]
    • parent_provers root_domain e-51f2fe49bf45c5d7 root: theorem check

      Parent-row provers of polytool polytool ?

    • preserver_image mobius, shift 0 e-bb5cb95fed86aa9c

      Affine, reversal and Möbius substitutions (elementary) polytool ?

      • premise (sequence): basis-map coefficients of Triangle of coefficients in expansion of x^n in terms of Laguerre polynomials L_n(x).
        uses: Every row P_n, n >= 1, is zero or real-rooted with all roots in (-inf, 0]
        • ↵ parent_provers root_domain e-51f2fe49bf45c5d7 (expanded above)

Related sequences ?

Same fingerprint (75)

Equal up to content, sign, reversal and a small index shift.

• A133080 → Veronese 2
• A023531 → 2D+1+2n → Veronese 2 (j=1)
• A038325 → γ
• A023531 → (θ+1)² → reverse
• A156992 → γ
• basis-map coefficients of A112227 → θ+1
• basis-map coefficients of A026729, shifted → θ+1
• A127733: Triangle read by rows: n-th row is n^2 preceded by (n-1) zeros.
• basis-map coefficients of A297191, shifted → θ+1
• basis-map coefficients of A scaled Hermite triangle.
• basis-map coefficients of A297191, shifted → D
• A023531 → D → (θ+1)²
• A127648: Triangle read by rows: row n consists of n zeros followed by n+1.
• basis-map coefficients of A026729, shifted → D
• A023531 → (θ+1)² → θ+1
• A135838 → γ
• A010054 → reverse → θ+1
• A196347 → γ
• A178822 → γ
• A344565 → γ
• A010054 → reverse → reverse
• basis-map coefficients of A026729, shifted → (θ+1)²
• A010054 → reverse → (θ+1)²
• A198954: Expansion of the rotational partition function for a heteronuclear diatomic molecule.
• basis-map coefficients of A021012 → reverse
• A010054 → reverse → D
• A010054 → reverse → (θ+1)²
• basis-map coefficients of A026729, shifted → reverse
• A038221 → γ
• basis-map coefficients of A030528, shifted → (θ+1)²
• A023531 → 2D+1+2n → Veronese 2
• A130123: Infinite lower triangular matrix with 2^k in the right diagonal and the rest zeros. Triangle, T(n,k), n zeros …
• basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >= 0, read by downwar…
• basis-map coefficients of A021012 → (θ+1)²
• basis-map coefficients of Square array of binomial coefficients T(n,k) = binomial(n,k), n >= 0, k >= 0, read by downwar…
• A136572 → θ+1
• basis-map coefficients of A026729 → (θ+1)²
• A023531: a(n) = 1 if n is of the form m(m+3)/2, otherwise 0.
• A136572 → (θ+1)²
• A136572 → D
• basis-map coefficients of A297191, shifted → (θ+1)²
• A178820 → γ
• basis-map coefficients of A030528, shifted → reverse
• A023531 → θ+1
• basis-map coefficients of A026729 → D
• A132440: Infinitesimal Pascal matrix: generator (lower triangular matrix representation) of the Pascal matrix, the clas…
• basis-map coefficients of Triangle of coefficients in expansion of x^n in terms of Laguerre polynomials L_n(x).
• A130123 → (θ+1)²
• A130123 → θ+1
• basis-map coefficients of A030528, shifted → D
• A010054 → reverse → reverse
• A085881 → γ
• A130123 → D
• A010054 → reverse → θ+1
• A010054 → reverse → D
• basis-map coefficients of A021012 → θ+1
• A023531 → (θ+1)² → D
• A023531 → (θ+1)² → (θ+1)²
• basis-map coefficients of Irregular triangle read by rows formed by taking every other row of the Delannoy array (A0082…
• A178821 → γ
• A010054 → reverse → θ+1
• basis-map coefficients of Triangle read by rows: T(n,k) = binomial(k,n-k). shifted by x -> -x + 0
• A038338 → γ
• A356546 → γ
• basis-map coefficients of A112227 → D
• A007318 → D → γ
• A010054 → reverse → D
• A028326 → γ
• basis-map coefficients of A030528, shifted → θ+1
• A127773: Triangle read by rows: row n consists of n-1 zeros followed by n(n+1)/2.
• A131431: 3n + 1 preceded by n zeros.
• A136572: Triangle read by rows: row n consists of n zeros followed by n!.
• A130123 → reverse
• A010054: a(n) = 1 if n is a triangular number, otherwise 0.
• basis-map coefficients of A112227 → (θ+1)²

References

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