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pseudocircle

4-point finite topological space weakly homotopy-equivalent to the circle
Thing Finite Topological Space Q7254653

Facts

2 properties
Instance of
finite topological space, sober space[2]
Defining formula
(\{a,b,c,d\},\{\{a,b,c,d\},\{a,b,c\},\{a,b,d\},\{a,b\},\{a\},\{b\},\varnothing\})[3]
🏷️ Also known as
en pseudocircle de Pseudokreis fr pseudocercle ja 擬円 pl Pseudookrąg ru псевдоокружность uk псевдоколо
🔖 Identifiers · 3
Freebase ID
/m/09ckz1
Microsoft Academic ID (discontinued)
2780010495
NLab ID
pseudocircle

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🔗 Connections
Instance of 2
finite topological space, sober space
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Summary

pseudocircle is a finite topological space[1].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [2] ↑ . wikidata.org.
  2. [3] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

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Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). pseudocircle. Retrieved November 6, 2026, from https://4ort.xyz/entity/pseudocircle
MLA “pseudocircle.” 4ort.xyz Knowledge Graph, 4ort.xyz, 6 Nov. 2026, https://4ort.xyz/entity/pseudocircle.
BibTeX @misc{4ortxyz_pseudocircle_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{pseudocircle}}, year = {2026}, url = {https://4ort.xyz/entity/pseudocircle}, note = {Accessed: 2026-11-06}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): pseudocircle — https://4ort.xyz/entity/pseudocircle (retrieved 2026-11-06)

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