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Hiroshi Haruki (Japanese: 春木 博 Haruki Hiroshi; died September 13, 1997) was a Japanese mathematician. A world-renowned expert in functional equations, he is best known for discovering "Haruki's theorem" and "Haruki's Lemma" in plane geometry.

Haruki earned his MSc and PhD from Osaka University and taught there. He was a professor at the University of Waterloo in Canada from 1966 till his retirement in 1986. He was a founding member of the university's computer science department (1967).


* News release, Department of Computer Science, University of Waterloo.

External links

* Haruki's theorem on MathWorld
* Haruki's Theorem of Overlapping circles at Dynamic Geometry Sketches Also with link to article with a proof.
* Hiroshi Haruki's Lemma (Interactive Mathematics Miscellany and Puzzles)
* Hiroshi Haruki's Theorem (Interactive Mathematics Miscellany and Puzzles)


Mathematics Encyclopedia

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