Proof step e-d0a93af714a782e4

basis_map A008277 → concludes about basis_map_A008277 of Riordan array (1/((1-x)(1-3x)),x/((1-x)(1-3x))). JSON

Theorem

Ray basis map theorem [MW08, Thm 2] polytool RealRooted rayBasisMap_maps_realRootedIn_iff ?

Operation

Image under a basis map u^k -> P_k

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

Premises

• Riordan array (1/((1-x)(1-3x)),x/((1-x)(1-3x))). (sequence)
  uses: Every row P_n, n >= 0, is zero or real-rooted with all roots in (-inf, 0]

Claims

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

Verification and certificate

• polytool: replayed (the certificate replayed when the step was written)
• Lean: not attempted
• certificate: basis_map, SHA-256 832496159fa807ba57bb8691761ecc466fc3f37ed93820e0e43886977520ccd1, 12,029 bytes (2,168 compressed); download JSON

Cited by

• n-18ebdea69763dba6 (one_signed_coefficients)
• n-18ebdea69763dba6 (hadamard_kernel)
• n-18ebdea69763dba6 (real_rooted)

References

1. [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