Proof step

Ray basis map theorem

Image under a basis map u^k -> P_k A008277

Concludes

Triangle of unsigned 2-Lah numbers.

Premises

basis_map_A007318 of Unsigned 2-Stirling numbers of the first kind.
sequence: Every row P_n, n >= 0, is zero or real-rooted with all roots in (-inf, 0]

Theorem

Checked

polytool replayed · Lean not attempted

Technical details

Step id

e-1b48038f0f313626 · JSON

Operation

Image under a basis map u^k -> P_k

{
  "map": "A008277",
  "operation": "basis_map"
}

Claims

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

Certificate

basis_map, SHA-256 2556c1d68bc82730c2a710580b96c124bc2c6cdfd8e40174e1bc2b47ed655564, 9,093 bytes (1,957 compressed); download

polytool replayed the certificate when the step was written.

Cited by

References

[MW08] Shi-Mei Ma and Yi Wang. q-Eulerian polynomials and polynomials with only real zeros. The Electronic Journal of Combinatorics, 15(1):Research Paper 17, January 2008. doi:10.37236/741