Norwegian mathematicians

Helge Holden (born 28 September 1956) is a Norwegian mathematician working in the field of differential equations and mathematical physics. He was Praeses of the Royal Norwegian Society of Sciences and Letters from 2014 to 2016.
He earned the dr.philos. degree at the University of Oslo in 1985. The title of his dissertation with Raphael Høegh-Krohn was Point Interactions and the Short-Range Expansion. A Solvable Model in Quantum Mechanics and Its Approximation. He was appointed professor at the Norwegian Institute of Technology (now: the Norwegian University of Science and Technology ) in 1991. His research interests are Differential equations, mathematical physics (in particular hyperbolic conservation laws and completely integrable systems), Stochastic analysis, and flow in porous media.
In 2014 he became Chairman of the board of the Abel Prize fund.He was elected Secretary General of the International Mathematical Union (IMU) for the period 2019–2022.

Arne Bernhard Sletsjøe (sometimes shown as Arne Slettsjø, born 8 April 1960) is a Norwegian mathematician and retired canoe sprinter who competed internationally in the mid to late 1980s.
He won two medals in the K-4 10000 m event at the ICF Canoe Sprint World Championships with a gold in 1987 and a silver in 1983. Sletsjøe also competed in two Summer Olympics in the K-4 1000 m event. At the 1984 Summer Olympics in Los Angeles, he was eliminated in the semifinals. Four years later in Seoul, Sletsjøe and his teammates made the semifinals, but did not finish. Sletsjøe later served as president of the Norwegian Canoe/ Kayak Federation.
He finished his secondary education at Oslo Cathedral School in 1977, graduated from the University of Oslo with the cand.real. degree in 1983 and took the doctorate in 1989. His academic advisor was Arnfinn Laudal. Sletsjøe still works at the university as an associate professor, having started out as a research fellow.He is a son of violist Arne Sletsjøe. He is married to Ingeborg Rasmussen, has two children and resides at Jar.

Ola Bratteli (24 October 1946 – 8 February 2015) was a Norwegian mathematician.
He was a son of Trygve Bratteli and Randi Bratteli (née Larssen). He received a PhD degree in 1974. He was appointed as professor at the University of Trondheim in 1980 and at the University of Oslo in 1991. He was a member of the Norwegian Academy of Science and Letters.

Knut Sydsæter (5 October 1937 – 29 September 2012) was a Norwegian mathematician.Professor of Mathematics at the University of Oslo.He is known for having written several books in mathematics for economic analysis, mainly in Norwegian and English.
However, his books have been released in several other languages such as Swedish, German, Italian, Chinese, Japanese, Portuguese, Spanish, Russian and Hungarian among others.