Proof step

Liu–Wang theorem with a lag row

Theorem check of the sequence's own rule liu wang derivative lag

Concludes: Triangle read by rows: T(n,k) is the number of k-matchings in the n-sunlet graph (0 <= k <= n).
Premises: none: a direct theorem check
Theorem: [LW07, Thm 2.1] RealRooted ?
Lean: RealRooted route sign RealRooted.threeTerm_interlaces_of_nonnegCoeffs, RealRooted.LiuWang.strictInterl_nonpos_lag_sequence
Checked: polytool replayed · Lean not attempted

Technical details

Step id

e-946bb852a8dd16a5 · JSON

Operation

Theorem check of the sequence's own rule

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

Claims

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

{
  "claim": "interlacing",
  "from_index": 2,
  "kind": "strict",
  "orientation": "previous_interlaces_next"
}

Certificate

theorem_check, SHA-256 ec9926c224a6430593427b754523764974218b6dc37c3656e2fafff397b63774, 5,904 bytes (1,590 compressed); download

polytool replayed the certificate when the step was written.

Cited by

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