Proof step e-c7b023a4533e2987

preserver_image reversal, shift 0 → concludes about Triangular array: row n gives the coefficients of the polynomial p(n,x) defined in Comments. JSON

Theorem

Affine, reversal and Möbius substitutions (elementary) polytool ?

Lean (RealRooted): route reversed RealRooted.X_pow_mul_reverse_eq_zero_or_splits, RealRooted.reflect_eq_zero_or_splits

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}}"
}

Premises

• Riordan array ((1+x)/(1-2x),x(1+x)/(1-2x)). (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 1520d2e300ccd3748125521f40df2676410f96595a7c81ceb8d6aa634547032b, 22,263 bytes (5,481 compressed); download JSON

Cited by

• n-e7331b0d50084c15 (one_signed_coefficients)
• n-e7331b0d50084c15 (hadamard_kernel)
• n-e7331b0d50084c15 (real_rooted)