John Casey

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Science and technology

Knowledge cost

2

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What Wikipedia says

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.

Excerpt from the Wikipedia article “John Casey (mathematician)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: No coneguts, Public domain, via Wikimedia Commons.