Proof step e-ef158e576c5477a7

basis_map A013610 → concludes about basis_map_A013610 of Triangle of Narayana numbers T(n,k) = C(n-1,k-1)*C(n,k-1)/k with 1 <= k <= n, read by rows. Also called the Catalan triangle. JSON

Theorem

Geometric basis map (elementary) polytool ?

Operation

Image under a basis map u^k -> P_k

{
  "map": "A013610",
  "operation": "basis_map"
}

Premises

• Triangle of Narayana numbers T(n,k) = C(n-1,k-1)*C(n,k-1)/k with 1 <= k <= n, read by rows. Also called the Catalan triangle. (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 d2c7de82fe7840e16e5fd545aa07395749b8c66e352c9dfaa7d51b8a263768f2, 13,984 bytes (2,618 compressed); download JSON

Cited by

• n-169aeabe58b22027 (real_rooted)
• n-169aeabe58b22027 (one_signed_coefficients)
• n-169aeabe58b22027 (hadamard_kernel)
• n-169aeabe58b22027 (interlacing)