Proof step e-25911b6df2da5b5f

basis_map A008277 → concludes about basis_map_A008277 of Triangle T(n,k), read by rows given by [1,0,1,0,0,0,0,0,0,...] DELTA [0,1,0,0,0,0,0,0,0,...] where DELTA is the operator defined in A08493… 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

• Triangle read by rows: T(n, k) = binomial(n + k, 2*k). (sequence)
  uses: Every row P_n, n >= 1, is zero or real-rooted with all roots in (-inf, 0]

Claims

• { "claim": "real_rooted", "from_index": 1, "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 60fc2df22bd8638489dfc98903f6eac4306edd49f03fdbf8a3aff210f8559aba, 12,029 bytes (2,161 compressed); download JSON

Cited by

• n-5d20c8ea29f3fbb9 (real_rooted)
• n-5d20c8ea29f3fbb9 (one_signed_coefficients)
• n-5d20c8ea29f3fbb9 (hadamard_kernel)

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