Niels Erik Nørlund (26 October 1885, in

Slagelse Slagelse () is a town on 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 Kalundborg and 14 km ...

– 4 July 1981, in

Copenhagen Copenhagen ( or .; da, København ) is the capital and most populous city of Denmark, with a proper population of around 815.000 in the last quarter of 2022; and some 1.370,000 in the urban area; and the wider Copenhagen metropolitan ar ...

) was a

Danish Danish may refer to: * Something of, from, or related to the country of Denmark People * A national or citizen of Denmark, also called a "Dane," see Demographics of Denmark * Culture of Denmark * Danish people or Danes, people with a Danish ance ...

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, structure, space, models, and change. History On ...

. 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 ...

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 and a ...

. The

Norlund Alps The Norlund Alps ( da, Nørlund Alper) 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– ...

and

Norlund Land Queen Margrethe II Land ( da, Dronning 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. ...

Greenland Greenland ( kl, Kalaallit Nunaat, ; da, Grønland, ) is an island country in North America that is part of the Kingdom of Denmark. It is located between the Arctic and Atlantic oceans, east of the Canadian Arctic Archipelago. Greenland is t ...

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 physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. B ...

Selected works

* * with René Lagrange as editor: * *

Selected works

See also

References

Further reading