John Casey (mathematician), Date of Birth, Place of Birth, Date of Death
TweetJohn Casey (mathematician)
Irish geometer
Date of Birth: 
Place of Birth: Kilbeheny, Ireland
About John Casey (mathematician)
- John Casey (12 May 1820, Kilbehenny, County Limerick, Ireland – 3 January 1891, Dublin) 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.
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