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Gury Vasilievich Kolosov  
  
90   02:00 مساءً   date: 4-4-2017
Author : A T Grigorian
Book or Source : Biography in Dictionary of Scientific Biography
Page and Part : ...


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Date: 4-4-2017 88
Date: 2-4-2017 77
Date: 31-3-2017 62

Born: 25 August 1867 in Ust, Novgorod guberniya, Russia

Died: 7 November 1936 in Leningrad (now St Petersburg), Russia


Gury Vasilievich Kolosov received his school education in St Petersburg where he attended the Gymnasium. He loved mathematics and physics, and proved himself an outstanding pupil at the high school, being awarded the gold medal in 1885. This was the year in which he graduated from the Gymnasium and entered the Faculty of Physics and Mathematics at the University of St Petersburg. He was awarded his first degree in 1889 but continued to study at the university for a qualification to allow him to teach.

He passed his Master's examinations in 1893 and his Master's dissertation On certain modifications of Hamilton's principle and its application to the solution of problems of mechanics of solid bodies (Russian) (1903) contained his first really significant result. This result, which he had first announced in a publication in 1898, was the discovery of [1]:-

... a new "integrated" case of motion for a top on a smooth surface, related to the turning of a solid body about a fixed point.

The paper which announced this important result was On one case of the motion of a heavy solid body supported by a point on a smooth surface (Russian) (1898). We should note at this point that a Master's Degree in Russia at this time was equivalent to what today would be Ph.D. level.

In 1908 Kolosov began working on the theory of elasticity and his doctoral thesis (equivalent to the German habilitation standard) contains Kolosov's formulas expressing the components of the stress tensor and the displacement vector in terms of two analytic functions of one complex variable. However this deep and important piece of work did provoke some controversy as is explained in [2]. Kolosov's thesis contained a formal solution of the plane problems of the theory of elasticity. After deriving these he successfully applied the formulas to solve some special cases. Steklov had been appointed to examine the thesis and at first he was not convinced that Kolosov's derivation of his formulas was rigorous. The paper [2] contains details of the interesting correspondence and a detailed analysis of Kolosov's work. Steklov was eventually became convinced that the derivation was satisfactory.

There are two interesting 'follow-ups' to these events. The first is that Steklov was right to question the work, but nevertheless it was correct. All doubts were finally removed when N I Muskhelishvili, a student of Kolosov, completely validated the results several years later. The second interesting comment is that Kolosov was not the first to discover the formulas now named after him . The first discoverer was Sergei Chaplygin who had derived them ten years earlier, but he had not thought them sufficiently important to publish - Chaplygin of course was quite wrong in this assessment and this fact alone would justify them now being named after Kolosov. The irony of this story is that Chaplygin had worked in the same department as Kolosov. The formulas were first published by Kolosov in his 1909 paper An application of the theory of functions of a complex variable to a planar problem in the mathematical theory of elasticity(Russian).

From 1893 Kolosov was employed both as the director of the mechanics laboratory at St Petersburg University, and as a teacher at the St Petersburg Institute of Communications Engineers. He worked at Yurev University from 1902 to 1913. If the name of this university is unfamiliar, then perhaps 'Tartu University' or 'Dorpat University' will be more familiar. All are names for the same institution founded in 1632 by Gustavus II Adolphus of Sweden. The Estonian name is Tartu, while the German and Swedish names for the same city (and university) are both Dorpat. However, between 1893 and 1918 the city was known as Yurev or Yuryev and it was during this period that Kolosov worked there. He was appointed in 1902 as a privatdozent then was promoted to professor during the eleven years he spent there.

In 1913 Kolosov returned to St Petersburg where he spent the rest of his career. He worked both at St Petersburg University, becoming head of the department of theoretical mechanics in 1916, and at the Electrotechnical Institute where he was appointed head of the department of theoretical mechanics immediately on his return to the city in 1913. Of course for much of this time (between 1914 and 1924), the city was known as Petrograd. After 1924 it became known as Leningrad. Kolosov worked in the famous city through a very difficult period since the Russian Revolution essentially began in St Petersburg in 1917. During the years of the civil war the city fell on very hard times and its population fell by two-thirds to around 700,000 over the three years 1917-1920. However after the civil war ended the city began to prosper again and by the time of Kolosov's death its population was nearly three million.

In addition to the important results we have mention above, we note that in 1907 Kolosov derived the solution for stresses around an elliptical hole. It showed that the concentration of stress could become far greater, as the radius of curvature at an end of the hole becomes small compared with the overall length of the hole. Engineers have to understand Kolosov results so that stresses can be kept to safe levels. Finally we mention his important text Application of a complex variable to the theory of elasticity (Russian) published in Moscow in1935.


 

  1. A T Grigorian, Biography in Dictionary of Scientific Biography (New York 1970-1990). 
    http://www.encyclopedia.com/doc/1G2-2830902358.html

Articles:

  1. N S Ermolaeva, G V Kolosov's doctoral dissertation and V A Steklov's evaluation of it (Russian), Istor.-Mat. Issled. 31 (1989), 52-75.
  2. B Khvedelidze and G Manjavidze, A survey of N. I. Muskhelishvili's scientific heritage, in Continuum mechanics and related problems of analysis, Tbilisi, 1991 ('Metsniereba', Tbilisi, 1993), 11-66.
  3. G Ryago, Gury Vasilievich Kolosov, Uchenye zapiski Tartuskogo 37 (1955), 96-103.
  4. G Ryago, From the life and activity of four remarkable mathematicians of the University of Tartu (Russian), Tartu. Gos. Univ. Trudy Estest.-Mat. Fak. 37 (1955), 74-105.

 




الجبر أحد الفروع الرئيسية في الرياضيات، حيث إن التمكن من الرياضيات يعتمد على الفهم السليم للجبر. ويستخدم المهندسون والعلماء الجبر يومياً، وتعول المشاريع التجارية والصناعية على الجبر لحل الكثير من المعضلات التي تتعرض لها. ونظراً لأهمية الجبر في الحياة العصرية فإنه يدرّس في المدارس والجامعات في جميع أنحاء العالم. ويُعجب الكثير من الدارسين للجبر بقدرته وفائدته الكبيرتين، إذ باستخدام الجبر يمكن للمرء أن يحل كثيرًا من المسائل التي يتعذر حلها باستخدام الحساب فقط.وجاء اسمه من كتاب عالم الرياضيات والفلك والرحالة محمد بن موسى الخورازمي.


يعتبر علم المثلثات Trigonometry علماً عربياً ، فرياضيو العرب فضلوا علم المثلثات عن علم الفلك كأنهما علمين متداخلين ، ونظموه تنظيماً فيه لكثير من الدقة ، وقد كان اليونان يستعملون وتر CORDE ضعف القوسي قياس الزوايا ، فاستعاض رياضيو العرب عن الوتر بالجيب SINUS فأنت هذه الاستعاضة إلى تسهيل كثير من الاعمال الرياضية.

تعتبر المعادلات التفاضلية خير وسيلة لوصف معظم المـسائل الهندسـية والرياضـية والعلمية على حد سواء، إذ يتضح ذلك جليا في وصف عمليات انتقال الحرارة، جريان الموائـع، الحركة الموجية، الدوائر الإلكترونية فضلاً عن استخدامها في مسائل الهياكل الإنشائية والوصف الرياضي للتفاعلات الكيميائية.
ففي في الرياضيات, يطلق اسم المعادلات التفاضلية على المعادلات التي تحوي مشتقات و تفاضلات لبعض الدوال الرياضية و تظهر فيها بشكل متغيرات المعادلة . و يكون الهدف من حل هذه المعادلات هو إيجاد هذه الدوال الرياضية التي تحقق مشتقات هذه المعادلات.