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Eric C. R. Hehner, called Rick, is a Canadian computer scientist. Eric Hehner was born on 16 September 1947 in Ottawa. He studied mathematics and physics at Carleton University, obtaining his first degree in 1969. He gained a PhD in computer science from the University of Toronto in 1974. He then joined the faculty there, becoming a full professor in 1983. He became the Bell University Chair in Software Engineering in 2001. Hehner's main research area is formal methods, particularly for programming. In 1979, Hehner invented a method of representing rational numbers with current University of Victoria professor Nigel Horspool called quote notation, which allows for easier arithmetic and produces no roundoff error in arithmetic calculations implementing a generalization of radix notation. Hehner has also influenced many other computer science researchers with his ideas, including Tony Hoare, especially with his concept of predicative programming. ==References== * E. C. R. Hehner, 1984. Predicative Programming. ''CACM'', 27(2):134–151. * E. C. R. Hehner, 1990. A Practical Theory of Programming. ''Science of Computer Programming'', 14(2–3):133–158. * E. C. R. Hehner, 2004. From Boolean Algebra to Unified Algebra. ''Mathematical Intelligencer'', 26(2):3–19. * ("A new representation of the rational numbers for fast easy arithmetic" ), E.C.R. Hehner and R.N.S. Horspool 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eric Hehner」の詳細全文を読む スポンサード リンク
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