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Juan Gutiérrez de Gualda
Juan Gutiérrez de Gualda (16th century) was a priest and mathematician known to be the author of a popular book on arithmetic.
== Life and work ==
Nothing is known about his life except he was the priest of Villarejo de Fuentes, province of Cuenca.〔, page 182.〕
Gutiérrez is known by his book on arithmetic which was very successful in his times: ''Arte breve y muy provechoso de cuenta castellana y arismética'' (Toledo 1539).〔, pages 200-201.〕 The book was reedited not less than five times in 16th century.〔, page 50.〕 It consist in a short arithmetic for merchants,〔, page 457.〕 very basic, which only contains forty pages and practically only explains the four rules and few more.〔, page 76.〕 The book is an example of the transition from roman numerals to arabic numerals because it resolves the problems with arabics (''quenta arismetica''), but it gives his expression in romans (''quenta castellana'').〔, page 201. , page 76.〕 His success was in big part due to the fact that Juan de Yciar included it as an annex of his book on calligraphy from 1564.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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