# John Casey

> John Casey was a respected Irish geometer. He is most famous for Casey's theorem on a circle that is tangent to four other circles, an extension of Ptolemy's theorem. However, he contributed several novel proofs and perspectives on Euclidean geometry. He and Émile Lemoine are considered to be the co-founders of the modern geometry of the circle and the triangle.

*Irish geometer (1820-1891)*

**Canonical URL:** https://fame.am/person/john-casey

## Identity
- **Profile type:** Academic ([Wikidata](https://www.wikidata.org/entity/Q39631))
- **Category:** Academics
- **Born:** 1820-05-12
- **Died:** 1891-01-03
- **Status:** deceased
- **Gender:** male

## Fame
- **Popularity score:** 41.8 / 100
- **Momentum:** 0.0 / 100  (trend: FALLING)
- **Historical depth:** 13.3 / 100
- **Attention shift:** 0.0 / 100
- **Source confidence:** 60.0 / 100
- **Profile completeness:** 60.0 / 100

## Sources
- [Джон Кейсі (математик)](https://uk.wikipedia.org/wiki/%D0%94%D0%B6%D0%BE%D0%BD_%D0%9A%D0%B5%D0%B9%D1%81%D1%96_(%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA))
- [جون كايزي](https://ar.wikipedia.org/wiki/%D8%AC%D9%88%D9%86_%D9%83%D8%A7%D9%8A%D8%B2%D9%8A)
- [چوهن كاسى](https://arz.wikipedia.org/wiki/%DA%86%D9%88%D9%87%D9%86_%D9%83%D8%A7%D8%B3%D9%89)
- [John Casey](https://ca.wikipedia.org/wiki/John_Casey)
- [John Casey](https://de.wikipedia.org/wiki/John_Casey)
- [John Casey (mathematician)](https://en.wikipedia.org/wiki/John_Casey_(mathematician))
- [John Casey (matemático)](https://es.wikipedia.org/wiki/John_Casey_(matem%C3%A1tico))
- [John Casey (mathématicien)](https://fr.wikipedia.org/wiki/John_Casey_(math%C3%A9maticien))
- [ジョン・ケイシー (数学者)](https://ja.wikipedia.org/wiki/%E3%82%B8%E3%83%A7%E3%83%B3%E3%83%BB%E3%82%B1%E3%82%A4%E3%82%B7%E3%83%BC_(%E6%95%B0%E5%AD%A6%E8%80%85))
- [존 케이시](https://ko.wikipedia.org/wiki/%EC%A1%B4_%EC%BC%80%EC%9D%B4%EC%8B%9C)
- [John Casey](https://nl.wikipedia.org/wiki/John_Casey)
- [John Casey](https://pl.wikipedia.org/wiki/John_Casey)
- [John Casey](https://pt.wikipedia.org/wiki/John_Casey)
- [Кейси, Джон](https://ru.wikipedia.org/wiki/%D0%9A%D0%B5%D0%B9%D1%81%D0%B8%2C_%D0%94%D0%B6%D0%BE%D0%BD)
- [John Casey (matematikçi)](https://tr.wikipedia.org/wiki/John_Casey_(matematik%C3%A7i))
- [Wikidata](https://www.wikidata.org/wiki/Q1699566)

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