◀ ▲ ▶History / Earlymiddleages / Person: AlUqlidisi, Abu&amp;#x27;l Hasan Ahmad ibn Ibrahim
Person: AlUqlidisi, Abu&amp;#x27;l Hasan Ahmad ibn Ibrahim
AlUqlidisi was an Islamic mathematician who wrote two works on arithmetic. He may have anticipated the invention of decimals.
Mathematical Profile (Excerpt):
 The manuscript gives alUqlidisi's full name on the front page as well as the information that he composed the text in Damascus in 95253.
 In the introduction alUqlidisi writes that he travelled widely and learnt from all the mathematicians he met on his travels.
 Other than being able to deduce a little of alUqlidisi's character from his writing, we have no other information on his life.
 The Kitab alfusul fi alhisab alHindi of alUqlidisi is the earliest surviving book that presents the Hindu system.
 There is plenty of evidence here that alUqlidisi must have been a teacher, for only a teacher would know understand the type of problem that a beginning student would encounter.
 The fourth part has considerable interest for it claims that up to this work by alUqlidisi the Indian methods had been used with a dust board.
 However, alUqlidisi showed how to modify the methods for pen and paper use.
 AlUqlidisi's work is historically important as it is the earliest known text offering a direct treatment of decimal fractions.
 AlUqlidisi uses decimal fractions as such, appreciates the importance of a decimal sign, and suggests a good one.
 1436/7) who treated decimal fractions in his "Miftah alHisab", but alUqlidisi, who lived five centuries earlier, is the first Muslim mathematician so far known to write about decimal fractions.
 Following Saidan's paper, some historians went even further in attributing to alUqlidisi the complete credit for giving the first complete description and applications of decimal fractions.
 The argument depends on how one interprets the following passage in alUqlidisi's treatise.
 unlike alSamawal, alUqlidisi never formulates the idea of completing the sequence of powers of ten by that of their inverse after having defined the zero power.
 There is no disagreement on the fact that alUqlidisi made a major step forward.
Born about 920, possibly Damascus, Syria. Died about 980, possibly Damascus, Syria.
View full biography at MacTutor
Tags relevant for this person:
Ancient Arab, Origin Syria, Special Numbers And Numerals
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References
Adapted from other CC BYSA 4.0 Sources:
 Oâ€™Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive