Proof step e-a802d54c8a2137b8

preserver_image mobius, shift 0 → concludes about mobius_x_over_x_plus_one of Riordan array ((1+x)/(1-2x),x(1+x)/(1-2x)). JSON

Theorem

Affine, reversal and Möbius substitutions (elementary) polytool ?

Lean (RealRooted): route fTransform RealRooted.splits_fPolynomial

Operation

Image under a real-rootedness preserver

{
  "index_shift": 0,
  "operation": "preserver_image",
  "operator": "{\"shape\":\"mobius\",\"a\":\"1\",\"b\":\"0\",\"c\":\"1\",\"e\":\"1\",\"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": { "lower": { "closed": true, "value": "-1" }, "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 589f23173569d54bea5f39a6440c0d0c1ac4f4a8b34f015fbc72b1f1e323441e, 23,044 bytes (5,717 compressed); download JSON

Cited by

• n-a0e65e4dc3f9251c (real_rooted)
• n-a0e65e4dc3f9251c (one_signed_coefficients)
• n-a0e65e4dc3f9251c (hadamard_kernel)