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De Thiende
De Thiende is a landmark publication authored by Simon Stevin in the 16th century. It was the first book in the western world to use decimal fractions. Although he did not invent the practice and notation system was complex, his pamphlet established the decimal system as a practice in mathematics.
==Simon Stevin's biography==
The Princeton Companion to Mathematics provides the following biographical information about Simon Stevin:
''The Flemish mathematician and engineer Simon Stevin is remembered for his study of decimal fractions. Although he was not the first to use decimal fractions (they are found in the work of the tenth-century Islamic mathematician al-Uqlidisi), it was his tract De Thiende (“The tenth”), published in 1585 and translated into English (as Disme: The Art of Tenths, or Decimall Arithmetike Teaching ) in 1608, that led to their widespread adoption in Europe. Stevin, however, did not use the notation we use today. He drew circles around the exponents of the powers of one tenth: thus he wrote 7.3486 as 7�3�4�8�6�4. In De Thiende Stevin not only demonstrated how decimal fractions could be used but also advocated that a decimal system should be used for weights and measures and for coinage.''
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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