Proof step

Liu–Wang theorem with a lag row

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

Concludes: Triangular T(n,k) = T(n-1, k) + T(n-1, k-1) + 5*T(n-2, k-1), read by rows.
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-2a115ada0e160737 · 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": 3,
  "kind": "strict",
  "orientation": "previous_interlaces_next"
}

Certificate

theorem_check, SHA-256 d353afbc08877a824706adbdf55a9c7485afc3e3003b59a7844ac98977ebd15c, 5,933 bytes (1,623 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