|
Christoph Rudolff (born 1499 in Jawor, Silesia, died 1545 in Vienna) was the author of the first German textbook on algebra. From 1517 to 1521, Rudolph was a student of Henricus Grammateus (Schreyber from Erfurt) at the University of Vienna and was the author of a book computing, under the title: ''ドイツ語:Behend und hübsch Rechnung durch die kunstreichen regeln Algebre so gemeinicklich die Coss genent werden'' (Nimble and beautiful calculation via the artful rules of algebra () are so commonly called "coss").〔Note: "Influenced by al-Khowarizmi and later Islamic writers who called the unknown (the variable ''x'' ) ''shai'', Arabic for "thing", Latin texts used ''res'' and those in Italian used ''cosa'' ("thing"). In Italy, algebra became known as ''l'arte della cosa'', in England as ''cossike arte'', or ''the rule of coss'', and in Germany, ''die Coss''." Jan Gullberg, ''Mathematics: From the Birth of Numbers'' (New York, New York: W.W. Norton, 1997), (page 299. )〕 He introduced the radical symbol (√) for the square root. It is believed that this was because it resembled a lowercase "r" (for "radix"), though there is no direct evidence.〔("History of Mathematical Symbols" by Douglas Weaver and Anthony D. Smith, University of South Australia )〕 Cajori only says that a "dot is the embryo of our present symbol for the square root" though it is "possible, perhaps probable" that Rudolff's later symbols are not dots but 'r's. Furthermore, he used the meaningful definition that ''x''0 = 1. ==See also== * History of mathematical notation 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「Christoph Rudolff」の詳細全文を読む スポンサード リンク
|