Proof step

Geometric basis map (elementary)

Image under a basis map u^k -> P_k A007318

Concludes

Riordan triangle ((1-x)/(1-2*x), x^2/(1-2*x)).

Premises

veronese_section_2_0 of binomial
sequence: Every row P_n, n >= 0, is zero or real-rooted with all roots in (-inf, 0]

Theorem

polytool ?

Checked

polytool replayed · Lean not attempted

Technical details

Step id

e-3d7a9e04409194cc · JSON

Operation

Image under a basis map u^k -> P_k

{
  "map": "A007318",
  "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 0a3822ab8136f4c68c8bd23bb584ec441714e2281ea32e56230961d874181e0e, 14,534 bytes (2,898 compressed); download

polytool replayed the certificate when the step was written.

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