Proof step e-7dc194e46d1f26fe

theorem_check three_term_recurrence → concludes about Triangle T(n, k) of numbers of square lattice walks that start and end at origin after 2*n steps and contain exactly k steps to the east, possibly touching ori… JSON

Theorem

Three-term recurrence criterion [Sze39, §3.3; Fav35] polytool ?

Operation

Theorem check of the node's own rule

{
  "operation": "theorem_check",
  "theorem": "three_term_recurrence"
}

Premises

None: this step is a direct theorem check.

Claims

• { "claim": "real_rooted", "from_index": 0, "region": { "upper": { "closed": false, "value": "0" } } }
• { "claim": "interlacing", "from_index": 1, "kind": "strict", "orientation": "previous_interlaces_next" }

Verification and certificate

• polytool: replayed (the certificate replayed when the step was written)
• Lean: not attempted
• certificate: theorem_check, SHA-256 1a02b8d3d444459d99c6428897a15465f232a0cd01d86859c8b2da658be60aef, 5,699 bytes (1,629 compressed); download JSON

Cited by

• n-fdc03fad975441d0 (real_rooted)
• n-fdc03fad975441d0 (one_signed_coefficients)
• n-fdc03fad975441d0 (hadamard_kernel)
• n-fdc03fad975441d0 (interlacing)

References

1. [Fav35] Jean Favard. Sur les polynômes de tchebicheff. C. R. Acad. Sci. Paris, 200:2052–2053, 1935.
2. [Sze39] G. Szegő. Orthogonal Polynomials. Colloquium publications, American Mathematical Society, 1939. doi:10.1090/coll/023