Proof step e-fe32eb1bdf118767

basis_map A007318 → concludes about basis_map_A007318 of Triangle read by rows: T(n,k) number of tilings of a 2n X 3 grid by dominoes, 2k of which are in a vertical position (0<=k<=n). JSON

Theorem

Geometric basis map (elementary) polytool ?

Operation

Image under a basis map u^k -> P_k

{
  "map": "A007318",
  "operation": "basis_map"
}

Premises

• Triangle read by rows: T(n,k) number of tilings of a 2n X 3 grid by dominoes, 2k of which are in a vertical position (0<=k<=n). (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" } } }
• { "claim": "interlacing", "from_index": 1, "kind": "weak", "orientation": "unordered" }

Verification and certificate

• polytool: replayed (the certificate replayed when the step was written)
• Lean: not attempted
• certificate: basis_map, SHA-256 80000bb59fe339786dfaa8cd95cb7d32e1316613d38214ba831eead6e7f7d21f, 13,441 bytes (2,543 compressed); download JSON

Cited by

• n-47b361d1e904fbeb (real_rooted)
• n-47b361d1e904fbeb (one_signed_coefficients)
• n-47b361d1e904fbeb (hadamard_kernel)
• n-47b361d1e904fbeb (interlacing)