Proof step `e-b403369ae2d1e52b`

preserver_image derivative_polynomial, shift 0 → concludes about T(n,j) for an iterated mixed order Laguerre transform. Coefficients of the normalized generalized Laguerre polynomials (-1)^n*n!*L(n,1-n,x). JSON

Theorem

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

Lean (RealRooted): RealRooted.splits_add_C_mul_derivative_all, RealRooted.splits_C_mul_add_derivative, Polynomial.Splits.derivative

Operation

Image under a real-rootedness preserver

{
  "index_shift": 0,
  "operation": "preserver_image",
  "operator": "{\"shape\":\"derivative_polynomial\",\"coefficients\":[{\"numerator\":[\"0\"],\"denominator\":[\"1\"]},{\"numerator\":[\"1\"],\"denominator\":[\"0\",\"1\"]},{\"numerator\":[\"-1\"],\"denominator\":[\"0\",\"1\"]}]}"
}

Premises

a(n) = 1 if n is of the form m(m+3)/2, otherwise 0. (sequence)
uses: Every row P_n, n >= 1, is zero or real-rooted with all roots in (-inf, 0]

Claims

{ "claim": "real_rooted", "from_index": 1, "region": {} }

Verification and certificate

polytool: replayed (the certificate replayed when the step was written)
Lean: not attempted
certificate: preserver_image, SHA-256 5dc050550a6444e7bed5745bb7eb65228d2c6af18168e3af5399cc5e2cb5ad41, 8,687 bytes (2,119 compressed); download JSON

Cited by

n-ae37fdb1a61214fb (real_rooted)

References

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

Proof step e-b403369ae2d1e52b