Proof step

Affine, reversal and Möbius substitutions (elementary)

Image under a real-rootedness preserver reversal, shift 0

Concludes

reversal of Triangle read by rows. T(n, k) = binomial(n - 1, k - 1)*(n + k)! / k!.

Premises

Triangle read by rows. T(n, k) = binomial(n - 1, k - 1)*(n + k)! / k!.
sequence: Every row P_n, n >= 0, is zero or real-rooted with all roots in (-inf, 0]

Theorem

polytool ?

Lean

RealRooted route reversed RealRooted.X_pow_mul_reverse_eq_zero_or_splits, RealRooted.reflect_eq_zero_or_splits

Checked

polytool replayed · Lean not attempted

Technical details

Step id

e-a9296ebc2b2330cd · JSON

Operation

Image under a real-rootedness preserver

{
  "index_shift": 0,
  "operation": "preserver_image",
  "operator": "{\"shape\":\"reversal\",\"schedule\":{\"first_index\":0,\"first_degree\":0,\"step\":1}}"
}

Claims

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

Certificate

preserver_image, SHA-256 edb5971beb7bdcc39c65864bd5c0f441e61fba0fec1ca371f7c64ed1f62ebf08, 10,693 bytes (2,918 compressed); download

polytool replayed the certificate when the step was written.

Cited by

n-8ef19f31fced7b25 (real_rooted)
n-8ef19f31fced7b25 (one_signed_coefficients)
n-8ef19f31fced7b25 (hadamard_kernel)