Proof step e-635d5bcbc56b7dbf

preserver_image reversal, shift 0 → concludes about reversal of Riordan array (1/(1-2*x), x*(1+x)/(1-2*x)). 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/(1-2*x), x*(1+x)/(1-2*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": { "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 676ddef182ddff587b5949d30e8524a5f2b6731d1f144e984e72a4475487534e, 19,338 bytes (4,551 compressed); download JSON

Cited by

• n-a0e88202514b92bb (real_rooted)
• n-a0e88202514b92bb (one_signed_coefficients)
• n-a0e88202514b92bb (hadamard_kernel)