Unresolvable Identifier

arXiv:2604.27545 · detector doi_compliance · cross_source · 2026-05-19 19:04:59.453874+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.1090/gsm/020.url:https://doi.org/10.1090/gsm/020' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. The cited work could not be located through any authoritative source.

Paper page Integrity report arXiv Try DOI

Evidence text

Graduate Studies in Mathematics. American Mathematical Society, Providence, RI, 1999, pp. xvi+558. isbn: 0-8218-0994-6.doi:10.1090/gsm/020.url:https://doi.org/10.1090/gsm/020. [Hat02] Allen Hatcher.Algebraic topology. Cambridge University Press, Cambridge, 2002, pp. xii+544. isbn: 0-521-79160-X; 0-521-79540-0. [Hat83] Allen E. Hatcher. “A proof of the Smale conjecture, Diff(S 3)≃O(4)”. In:Ann. of Math. (2) 117.3 (1983), pp. 553–607.issn: 0003-486X,1939-8980.doi:10.2307/2007035.url:https: //doi.org/10.2307/2007035. [HS20] Neil R. Hoffman and Nathan S. Sunukjian. “Null-homologous exotic surfaces in 4-manifolds”. In:Algebr. Geom. Topol.20.5 (2020), pp. 2677–2685.issn: 1472-2747,1472-2739.doi:10. 2140/agt.2020.20.2677.url:https://doi.org/10.2140/agt.2020.20.2677. [Kim06] Hee Jung Kim. “Modifying surfaces in 4-manifolds by twist spinning”. In:Geom. Topol.10 (2006), pp. 27–56.issn: 1465-3060,1364-0380.doi:10.2140/gt.2006.10.27.url:https: //doi.org/10.2140/gt.2006.10.27. REFERENCES 19 [Kir96] Rob Kirby. “Akbulut’s corks andh-cobordisms of smooth, simply connected 4-manifolds”. In:Turkish J. Math.20.1 (1996), pp. 85–93.issn: 1300-0098,1303-6149. [KMT24] Hokuto Konno, Abhishek Mallick, and Masaki Taniguchi.Exotically knotted closed surfaces from Donaldson’s diagonalization for families

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.1090/gsm/020.url:https://doi.org/10.1090/gsm/020",
  "raw_excerpt": "Graduate Studies in Mathematics. American Mathematical Society, Providence, RI, 1999, pp. xvi+558. isbn: 0-8218-0994-6.doi:10.1090/gsm/020.url:https://doi.org/10.1090/gsm/020. [Hat02] Allen Hatcher.Algebraic topology. Cambridge University Press, Cambridge, 2002, pp. xii+544. isbn: 0-521-79160-X; 0-521-79540-0. [Hat83] Allen E. Hatcher. \u201cA proof of the Smale conjecture, Diff(S 3)\u2243O(4)\u201d. In:Ann. of ",
  "ref_index": 4,
  "verdict_class": "cross_source"
}