Proof step

Affine, reversal and Möbius substitutions (elementary)

Image under a real-rootedness preserver reversal, shift 0

Concludes

reversal of Stirling2 triangle with scaled diagonals (powers of 4).

Premises

Stirling2 triangle with scaled diagonals (powers of 4).
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-5e1de8db42690623 · JSON

Operation

Image under a real-rootedness preserver

{
  "index_shift": 0,
  "operation": "preserver_image",
  "operator": "{\"shape\":\"reversal\",\"schedule\":{\"first_index\":0,\"first_degree\":2,\"step\":1}}"
}

Claims

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

Certificate

preserver_image, SHA-256 cd1efd600f6fe8842f2e02086c13c7fd6c07d9b8058a43b1e38fcd9df6f0770f, 10,584 bytes (2,671 compressed); download

polytool replayed the certificate when the step was written.

Cited by

n-9ada29ffbad64b45 (real_rooted)
n-9ada29ffbad64b45 (one_signed_coefficients)
n-9ada29ffbad64b45 (hadamard_kernel)