View source for Aida Yasuaki

{{short description|Japanese mathematician}}
{{Infobox scientist
|name              = Aida Yasuaki
|box_width         =
|image             = Aida Yasuaki.jpeg
|image_size         = 200px
|caption           =
|birth_date        = {{Birth date|df=yes|1747|2|10}}
|death_date        = {{Death date and age|df=yes|1817|10|26|1747|2|10}}
|birth_place       = 
|death_place  	 =
|nationality       = Japanese
|field             = Mathematics
|known_for         = 
| notable_students  = 
|prizes            =
}}
{{family name hatnote|Aida|lang=Japanese}}
{{nihongo|'''Aida Yasuaki'''|会田 安明||February 10, 1747 – October 26, 1817}} also known as '''Aida Ammei''', was a Japanese [[mathematician]] in the [[Edo period]].<ref>Smith, David. (1914). {{Google books|J1YNAAAAYAAJ|''A History of Japanese Mathematics,'' p. 188. |page=188}}</ref>

He made significant contributions to the fields of [[number theory]] and [[geometry]], and furthered methods for simplifying [[continued fractions]].

Aida created an original symbol for "equal".  This was the first appearance of the notation for equal in East Asia.<ref name="jochi38">Jochi, Shigeru. (1997). {{Google books|raKRY3KQspsC&dq|"Aida, Yasuaki," ''Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures,'' p. 38. |page=38}}</ref>

==Selected works==
In a statistical overview derived from writings by and about Aida Yasuaki, [[OCLC]]/[[WorldCat]] encompasses roughly 50 works in 50+ publications in 1 language and 50+ library holdings.<ref>[http://www.oclc.org/research/activities/identities/default.htm  WorldCat Identities] {{Webarchive|url=https://web.archive.org/web/20101230150412/http://www.oclc.org/research/activities/identities/default.htm |date=2010-12-30 }}: [http://www.worldcat.org/identities/lccn-nr00-33906  会田安明 1747–1817] {{Webarchive|url=https://web.archive.org/web/20160315205139/http://worldcat.org/identities/lccn-nr00-33906/ |date=2016-03-15 }}</ref>
{{dynamic list}}
*1784 — {{nihongo|''Shoyaku konʼitsujutsu''|諸約混一術}} [https://www.worldcat.org/search?q=no:%22057343766%22 OCLC 22057343766]
*1785 — {{nihongo|''Kaisei sanpō''|改精算法}} [https://www.worldcat.org/search?q=no:%22049703851%22 OCLC 22049703851], ''Counter-arguments with seiyo sampō''<ref name="jochi38"/>
*1787 — {{nihongo|''Kaisei sanpō kaiseiron''|改精算法改正論}} [https://www.worldcat.org/search?q=no:%22056510030%22 OCLC 22056510030], ''Counter-arguments with seiyo sampō, new edition''<ref name="jochi38"/>
*1788 — {{nihongo|''Kaiwaku sanpō''|解惑筭法}} [https://www.worldcat.org/search?q=no:%22056510044%22 OCLC 22056510044]<ref name="jochi38"/>
*1797 — {{nihongo|''Sanpō kakujo''|筭法廓如}} [https://www.worldcat.org/search?q=no:%22057185824%22 OCLC 22057185824]<ref name="jochi38"/>
*1801 — {{nihongo|''Sanpō hi hatsuran''|筭法非撥亂}} [https://www.worldcat.org/search?q=no:%22057185770%22 OCLC 22057185770]<ref name="jochi38"/>
* 1811 — {{nihongo|''Sanpō tensei-ho shinan''|算法天生法指南|Mathematical Introduction of 'Tensei-ho}}<ref name="jochi38"/>

==See also==
*[[Sangaku]], the custom of presenting mathematical problems, carved in wood tablets, to the public in [[shinto shrines]]
*[[Soroban]], a Japanese [[abacus]]
*[[Japanese mathematics]]

==Notes==
{{Reflist|30em}}

==References==
*Endō Toshisada (1896). {{nihongo|''History of mathematics in Japan''|日本數學史史  |Dai Nihon sūgakush}}. Tōkyō: _____. {{OCLC|122770600}}
*Restivo, Sal P. (1992). [https://books.google.com/books?id=gvMm0jv-xPIC&q=Yoshida+Koyu+arithmetic  ''Mathematics in Society and History: Sociological Inquiries.''] Dordrecht: Kluwer Academic Publishers. {{ISBN|978-0-7923-1765-4}}; {{OCLC|25709270}}
*[[Helaine Selin|Selin, Helaine]]. (1997). [https://books.google.com/books?id=raKRY3KQspsC&q=Aida+Yasuaki   ''Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures.''] Dordrecht: [[Kluwer]]/[[Springer Science+Business Media|Springer]]. {{ISBN|978-0-7923-4066-9}}; {{OCLC|186451909}}
*Shimodaira, Kazuo. (1970). "Aida Yasuaki", ''[[Dictionary of Scientific Biography]].'' New York: Charles Scribner's Sons. {{ISBN|0-684-10114-9}}
*[[David Eugene Smith]] and [[Yoshio Mikami]]. (1914). [https://books.google.com/books?id=J1YNAAAAYAAJ&q=Shiraishi+Chochu   ''A History of Japanese Mathematics.''] Chicago: Open Court Publishing. {{OCLC|1515528}}[https://archive.org/details/historyofjapanes00smitiala – note alternate online, full-text copy at archive.org]
*[[J. Marshall Unger]]. (2015). Sangaku ''Proofs: A Japanese Mathematician at Work.''  Ithaca, N.Y.:  Cornell East Asian Series.
*[[J. Marshall Unger]]. (2017). Sangaku ''Reflections: A Japanese Mathematician Teaches.''  Ithaca, N.Y.:  Cornell East Asian Series.

==External links==
*{{MacTutor Biography|id=Aida}}

{{Authority control}}

{{DEFAULTSORT:Aida, Yasuaki}}
[[Category:18th-century Japanese mathematicians]]
[[Category:19th-century Japanese mathematicians]]
[[Category:Number theorists]]
[[Category:Japanese geometers]]
[[Category:1747 births]]
[[Category:1817 deaths]]
[[Category:Writers of the Edo period]]
[[Category:Scientists from Yamagata Prefecture]]