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Finsler–Hadwiger theorem : ウィキペディア英語版 | Finsler–Hadwiger theorem
The Finsler–Hadwiger theorem is statement in Euclidean plane geometry that describes a third square derived from any two squares that share a vertex. The theorem is named after Paul Finsler and Hugo Hadwiger, who published it in 1937 as part of the same paper in which they published the Hadwiger–Finsler inequality relating the side lengths and area of a triangle.〔. See in particular p. 324.〕 To state the theorem, suppose that ABCD and AB'C'D' are two squares with common vertex A. Let E and G be the midpoints of B'D and D'B respectively, and let F and G be the centers of the two squares. Then the theorem states that the quadrilateral EFGH is s square as well.〔.〕 ==References==
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