Proof step `e-2c8197af5d9a4024`

preserver_image derivative_polynomial, shift 0 → concludes about derivative of Number triangle T(n,k)=C(n,k)C(2,n-k). 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\":[\"1\"]}]}"
}

Premises

Number triangle T(n,k)=C(n,k)C(2,n-k). (sequence)
uses: Every row P_n, n >= 0, is zero or real-rooted with all roots in (-inf, 0]

Claims

{ "claim": "real_rooted", "from_index": 0, "region": { "upper": { "closed": true, "value": "0" } } }

Verification and certificate

polytool: replayed (the certificate replayed when the step was written)
Lean: not attempted
certificate: preserver_image, SHA-256 2f0ad0c688ef067ef97d400b57311c9e52c2f2058689f11eff37d5d02365b98d, 8,781 bytes (2,286 compressed); download JSON

Cited by

n-fdf7b22232b1fd38 (real_rooted)
n-fdf7b22232b1fd38 (one_signed_coefficients)
n-fdf7b22232b1fd38 (hadamard_kernel)

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-2c8197af5d9a4024