Joseph Gustave Jacques Deruyts (18 March 1862,

Liège Liège ( ; ; ; ; ) is a City status in Belgium, city and Municipalities in Belgium, municipality of Wallonia, and the capital of the Liège Province, province of Liège, Belgium. The city is situated in the valley of the Meuse, in the east o ...

– 5 July 1945, Liège)Deruyts, Joseph Gustave Jacques, bestor.be
/ref> was a Belgian

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, mathematical structure, structure, space, Mathematica ...

, known as a pioneer of

group representation theory In the mathematical field of representation theory, group representations describe abstract groups in terms of bijective linear transformations of a vector space to itself (i.e. vector space automorphisms); in particular, they can be used to r ...

. He is the elder brother of the mathematician :fr:François Deruyts Deruyts received his doctorate in 1883 from the

University of Liège The University of Liège (), or ULiège, is a major public university of the French Community of Belgium founded in 1817 and based in Liège, Wallonia, Belgium. Its official language is French (language), French. History The university was foun ...

and was appointed there as assistant to Louis Pérard in

experimental physics Experimental physics is the category of disciplines and sub-disciplines in the field of physics that are concerned with the observation of physical phenomena and experiments. Methods vary from discipline to discipline, from simple experiments and o ...

. Deruyts joined the academic staff in mathematics and was appointed in 1883 a professor of geometry at the University of Liège, where he remained until retirement as professor emeritus. He was elected in 1892 as a member of the

Royal Academy of Science, Letters and Fine Arts of Belgium The Royal Academy of Science, Letters and Fine Arts of Belgium ( , sometimes referred to as ' ) is the independent learned society of science and arts of the French Community of Belgium. One of Belgium's numerous academies, it is the French-speak ...

, which has been awarding since 1952 the Jacques Deruyts Prize. He published in 1892 a treatise ''Essai d'une théorie générale des formes algébriques'' which was pioneering research in the representation theory of linear groups and

algebraic groups In mathematics, an algebraic group is an algebraic variety endowed with a group structure that is compatible with its structure as an algebraic variety. Thus the study of algebraic groups belongs both to algebraic geometry and group theory. Many ...

. He was an Invited Speaker of the

ICM ICM may refer to: Organizations * Irish Church Missions, an Anglican mission * Institut du Cerveau, the Paris Brain Institute, a research center * Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw * Interna ...

with talk "Sur la théorie algébrique des formes à séries de ''n'' variables" in 1920 at

Strasbourg Strasbourg ( , ; ; ) is the Prefectures in France, prefecture and largest city of the Grand Est Regions of France, region of Geography of France, eastern France, in the historic region of Alsace. It is the prefecture of the Bas-Rhin Departmen ...

References

1862 births 1945 deaths 19th-century Belgian mathematicians 20th-century Belgian mathematicians Scientists from Liège Members_of_the_Royal_Academy_of_Belgium {{Europe-mathematician-stub