Counterexamples in Analysis¶
Gelbaum, B. R., & Olmsted, J. M. H. (1964). Counterexamples in Analysis.
Cited by¶
1 citation across 1 artifact.
Each citation links to the sentence it supports in the citing article.
Domain-specific¶
- Gδ Set
- The popcorn function has the irrationals as its continuity set, providing a concrete non-open Gδ example
This sourceGelbaum and Olmsted give the standard example of a function continuous at every irrational and discontinuous at every rational; reading its continuity set as a non-open G-delta is the classification the article adds.
Supported in partVerified against the source
- The popcorn function has the irrationals as its continuity set, providing a concrete non-open Gδ example
Verification¶
Does it exist? Not checked yet. This entry carries no identifier to resolve. It was extracted from the citation as written in the article, normalized, and deduplicated against the rest of the registry.
Does it back the claim? Read against the text for 1 of 1 citation: 1 supported in part. Each verdict is shown under its citation below, with what in the work backs the sentence.
Support is checked per citation rather than per work — the same source can be cited soundly in one article and wrongly in another. Per-citation recording began recently, so a citation with no recorded check is a gap in the record rather than evidence it went unchecked.
See how references were verified.
Registry ID ref:26a7d247253c · see in the full table