William Kahan

William "Velvel" Morton Kahan (an haife shi a ranar 5 ga Yuni, 1933) masanin lissafi ne na Kanada kuma masanin kimiyyar kwamfuta, wanda farfesa ne a Jami'ar California, Berkeley . Ya sami lambar yabo ta Turing a shekarar 1989 don "babban gudummawarsa ga nazarin lambobi".

 Tarihin rayuwa 
An haife shi ne a cikin iyalin Yahudawa na Kanada,  ya halarci Jami'ar Toronto, inda ya sami digiri na farko a shekara ta 1954, digiri na biyu a shekara ta 1956, da Ph.D. a shekara ta 1958, duk a fagen lissafi. Kahan yanzu farfesa ne na ilmin lissafi da injiniyan lantarki da kimiyyar kwamfuta (EECS) a Jami'ar California, Berkeley .

Kahan shine babban masanin gine-gine a bayan ma'auni na IEEE 754-1985 don lissafin ma'aunin ruwa (da kuma bin sa mai zaman kansa, IEEE 854). An kira shi "Uba na Floating Point", tun lokacin da ya taimaka wajen kirkirar asalin IEEE 754 specification. Kahan ya ci gaba da gudummawarsa ga sake fasalin IEEE 754 wanda ya haifar da ma'auni na IEEE 754.

A cikin shekarun 1980s ya haɓaka shirin "paranoia", alamar da ke gwadawa don nau'ikan kwari masu tasowa.[1] Ya kuma haɓaka algorithm na tarawa na Kahan, wani muhimmin algorithm don rage kuskuren da aka gabatar yayin ƙara jerin lambobi masu tasowa masu iyaka. Ya kirkiro kalmar "Table-maker's dilemma" don farashin da ba a sani ba na daidaita ayyukan da suka wuce daidai ga wasu lambobi da aka riga aka sanya.[2]

Davis-Kahan-Weinberger dilation theorem yana daya daga cikin alamun sakamako a cikin ka'idar dilation na masu aiki da sararin samaniya na Hilbert kuma ya sami aikace-aikace a wurare daban-daban.

Shi mai ba da shawara ne game da ingantaccen ilimi na yawan lissafin lissafi game da batutuwan da ke iyo kuma a kai a kai yana sukar yanke shawara a cikin ƙirar kwamfutoci da harsunan shirye-shirye waɗanda ya yi imanin za su lalata ƙididdigar da ke iyo.

Lokacin da Hewlett-Packard (HP) ya gabatar da lissafin kimiyya na aljihu na HP-35, daidaitattun lambobi a kimanta ayyukan da suka fi dacewa don wasu muhawara ba su da kyau. HP ta yi aiki sosai tare da Kahan don inganta daidaito na algorithms, wanda ya haifar da manyan ci gaba. An rubuta wannan a lokacin a cikin Hewlett-Packard Journal .  Ya kuma ba da gudummawa sosai ga ƙirar algorithms a cikin Jerin HP Voyager kuma ya rubuta wani ɓangare na matsakaici da kuma ingantaccen jagororin su.

An kira Kahan Fellow na ACM a cikin 1994, kuma an shigar da shi cikin Kwalejin Injiniya ta Kasa a cikin 2005. 

 Dubi kuma 

 Intel 8087

 Manazarta 

Rukuni:Rayayyun mutane
Rukuni:Haifaffun 1933
Rukuni:Shafuka masu fassarorin da ba'a duba ba