Proof step e-8b470702f19ec444

preserver_image affine, shift 0 → concludes about Signed double Pochhammer triangle: expansion of x(x-2)(x-4)..(x-2n+2). JSON

Theorem

Affine, reversal and Möbius substitutions (elementary) polytool ?

Lean (RealRooted): Polynomial.Splits.comp_of_degree_le_one

Operation

Image under a real-rootedness preserver

{
  "index_shift": 0,
  "operation": "preserver_image",
  "operator": "{\"shape\":\"affine\",\"slope\":\"-1\",\"intercept\":\"1\"}"
}

Premises

• Triangle of coefficients in expansion of (x+1)*(x+3)*...*(x + 2n - 1) in rising powers of x. (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": { "lower": { "closed": true, "value": "1" } } }
• { "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 48819c140300de7b6629a298f558254ba519a6ef4ea63bcf7248e26c602e553d, 10,395 bytes (2,901 compressed); download JSON

Cited by

• n-f2cd67e92f70216b (real_rooted)
• n-f2cd67e92f70216b (one_signed_coefficients)
• n-f2cd67e92f70216b (interlacing)