Niels Erik Nørlund (26 October 1885, in

Slagelse Slagelse () is a town on Zealand (Denmark), Zealand, Denmark. The town is the seat of Slagelse Municipality, and is the biggest town of the municipality. It is located 15 km east of Korsør, 16 km north-east of Skælskør, 33 km south-east of Ka ...

– 4 July 1981, in

Copenhagen Copenhagen ( ) is the capital and most populous city of Denmark, with a population of 1.4 million in the Urban area of Copenhagen, urban area. The city is situated on the islands of Zealand and Amager, separated from Malmö, Sweden, by the ...

) was a Danish

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 ...

. His book ''Vorlesungen über Differenzenrechnung'' (1924, reprinted 1954) was the first book on

complex function Complex analysis, traditionally known as the theory of functions of a complex variable, is the branch of mathematical analysis that investigates functions of complex numbers. It is helpful in many branches of mathematics, including algebraic g ...

solutions of

difference equation In mathematics, a recurrence relation is an equation according to which the nth term of a sequence of numbers is equal to some combination of the previous terms. Often, only k previous terms of the sequence appear in the equation, for a parameter ...

s. His doctoral students include

Georg Rasch Georg William Rasch () (21 September 1901 – 19 October 1980) was a Danish mathematician, statistician, and psychometrician, most famous for the development of a class of measurement models known as Rasch models. He studied with R.A. Fisher an ...

. The

Norlund Alps The Norlund Alps () are a mountain range in King Christian X Land, East Greenland. Administratively these mountains are part of the Northeast Greenland National Park.Google Earth History The range was named during the 1929–1930 Expedition to ...

and

Norlund Land Queen Margrethe II Land (; ) is a peninsula in the northern limit of King Christian X Land, northeastern Greenland. Administratively it belongs to the Northeast Greenland National Park, NE Greenland National Park area. History The peninsula was ...

Greenland Greenland is an autonomous territory in the Danish Realm, Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. Citizens of Greenlan ...

were named after him. He was also the brother of Margrethe Nørlund Bohr and brother-in-law of Nobel Prize winning physicist

Niels Bohr Niels Henrik David Bohr (, ; ; 7 October 1885 – 18 November 1962) was a Danish theoretical physicist who made foundational contributions to understanding atomic structure and old quantum theory, quantum theory, for which he received the No ...

Selected works

* * with René Lagrange as editor: * *

Selected works

See also

References

Further reading