Proof step

Geometric basis map (elementary)

Image under a basis map u^k -> P_k A038231

Concludes

Riordan array (1+2x,x(1+x)).

Premises

basis-map coefficients of Riordan array (1+2x,x(1+x)).
sequence: Every row P_n, n >= 0, is zero or real-rooted with all roots in (-inf, 4]

Theorem

polytool ?

Checked

polytool replayed · Lean not attempted

Technical details

Step id

e-85b4a65fd7921bf7 · JSON

Operation

Image under a basis map u^k -> P_k

{
  "map": "A038231",
  "operation": "basis_map"
}

Claims

{
  "claim": "real_rooted",
  "from_index": 0,
  "region": {
    "upper": {
      "closed": true,
      "value": "0"
    }
  }
}

{
  "claim": "interlacing",
  "from_index": 1,
  "kind": "weak",
  "orientation": "unordered"
}

Certificate

basis_map, SHA-256 a6907f33e4300a8b2b323e921bbca8c5eca04fecf635e152ccd308e9e115295a, 14,338 bytes (2,755 compressed); download

polytool replayed the certificate when the step was written.

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