Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Krein resolvent formula | Statement: [Schrödinger equation with point interactions, relatedTo, Krein resolvent formula]

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: Krein resolvent formula
Triple: [Schrödinger equation with point interactions, relatedTo, Krein resolvent formula]

The Krein resolvent formula is a fundamental result in operator theory that expresses the resolvent of a self-adjoint extension of a symmetric operator in terms of the resolvent of a reference extension and a finite-rank correction, widely used in the analysis of Schrödinger operators with point interactions.