Proof step

Affine, reversal and Möbius substitutions (elementary)

Image under a real-rootedness preserver reversal, shift 0

Concludes

Triangle read by rows: T(n,k) is the number of ternary strings of length n with k indispensable digits, with 0 <= k <= n.

Premises

Triangle, read by rows, of pairwise sums of trinomial coefficients (A027907).
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-c6f91fa383aec347 · 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 f7e4d9aba33834a86cff340eb6c843e46e57fb3f3a9de06c92a7c9ac9182a303, 8,080 bytes (2,356 compressed); download

polytool replayed the certificate when the step was written.

Cited by

n-b1a7dcc8610d7e32 (one_signed_coefficients)
n-b1a7dcc8610d7e32 (hadamard_kernel)
n-b1a7dcc8610d7e32 (real_rooted)