Proof step

Liu–Wang theorem for three-term recurrences

Theorem check of the sequence's own rule liu wang three term

Concludes: A skewed version of triangular array A122075.
Premises: none: a direct theorem check
Theorem: [LW07, Thm 2.1, Thm 2.3, Cor 2.4, Prop 3.3] polytool ?
Lean: RealRooted route window RealRooted.threeTerm_interlaces_of_roots_mem_Icc
Checked: polytool replayed · Lean not attempted

Technical details

Step id

e-e6a995064f37abd4 · JSON

Operation

Theorem check of the sequence's own rule

{
  "operation": "theorem_check",
  "theorem": "liu_wang_three_term"
}

Claims

{
  "claim": "real_rooted",
  "from_index": 0,
  "region": {
    "lower": {
      "closed": true,
      "value": "-1"
    },
    "upper": {
      "closed": true,
      "value": "0"
    }
  }
}

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

Certificate

theorem_check, SHA-256 06aab5178290c5c2d2b50ee51b77b7d009e8ca91b0fffac7e223765851195b30, 4,943 bytes (1,361 compressed); download

polytool replayed the certificate when the step was written.

Cited by

n-540fd96c9759fa70 (real_rooted)
n-540fd96c9759fa70 (one_signed_coefficients)
n-540fd96c9759fa70 (hadamard_kernel)
n-540fd96c9759fa70 (interlacing)

References

[LW07] Lily L. Liu and Yi Wang. A unified approach to polynomial sequences with only real zeros. Advances in Applied Mathematics, 38(4):542–560, May 2007. doi:10.1016/j.aam.2006.02.003