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# Piers Bohl

Piers Bohl (October 23, 1865 – December 25, 1921) was a Latvian mathematician, who worked in differential equations, topology and quasi-periodic functions. [1]

## Almost periodic function

In mathematics, an almost periodic function is, loosely speaking, a function of a real number that is periodic to within any desired level of accuracy, given suitably long, well-distributed "almost-periods".

## Baltic Germans

The Baltic Germans (Deutsch-Balten or Deutschbalten, later Baltendeutsche) are ethnic German inhabitants of the eastern shores of the Baltic Sea, in what today are Estonia and Latvia.

## Brouwer fixed-point theorem

Brouwer's fixed-point theorem is a fixed-point theorem in topology, named after L. E. J. (Bertus) Brouwer.

## Differential equation

A differential equation is a mathematical equation that relates some function with its derivatives.

## Harald Bohr

Harald August Bohr (22 April 1887 – 22 January 1951) was a Danish mathematician and soccer player.

## Latvia

Latvia (or; Latvija), officially the Republic of Latvia (Latvijas Republika), is a sovereign state in the Baltic region of Northern Europe.

## Mathematician

A mathematician is someone who uses an extensive knowledge of mathematics in his or her work, typically to solve mathematical problems.

## Mathematics

Mathematics (from Greek μάθημα máthēma, "knowledge, study, learning") is the study of such topics as quantity, structure, space, and change.

## Quasiperiodic function

In mathematics, a quasiperiodic function is a function that has a certain similarity to a periodic function.

## Riga

Riga (Rīga) is the capital and largest city of Latvia.

## Topology

In mathematics, topology (from the Greek τόπος, place, and λόγος, study) is concerned with the properties of space that are preserved under continuous deformations, such as stretching, crumpling and bending, but not tearing or gluing.

## University of Tartu

The University of Tartu (UT; Tartu Ülikool, Universitas Tartuensis) is a classical university in the city of Tartu, Estonia.

## Viljandi

Viljandi (Fellin) is a town and municipality in southern Estonia with a population of 17,473 in 2013.

## Walk, Livonia

Walk was the historical German name for the town that is since 1920 divided into Valga in Estonia and Valka in Latvia.

## References

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