Proof step `e-7729d1773ce70fbd`

preserver_image derivative_polynomial, shift 0 → concludes about derivative of Triangle read by rows, T(n, k) = binomial(n, k)*binomial(n + 2, 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

Triangle read by rows, T(n, k) = binomial(n, k)*binomial(n + 2, 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" } } }
{ "claim": "interlacing", "from_index": 1, "kind": "weak", "orientation": "unordered" }

Verification and certificate

polytool: replayed (the certificate replayed when the step was written)
Lean: not attempted
certificate: preserver_image, SHA-256 d63da736375c04c839d348b168baf4134d20cb25041b8452c9ee517a3df49870, 15,311 bytes (3,452 compressed); download JSON

Cited by

n-82cc9c378f27e13e (interlacing)
n-82cc9c378f27e13e (real_rooted)
n-82cc9c378f27e13e (one_signed_coefficients)
n-82cc9c378f27e13e (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-7729d1773ce70fbd