Piers Bohl

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

Piers Bohl
Born(1865-10-23)October 23, 1865
Walk, Livonia
DiedDecember 25, 1921(1921-12-25) (aged 56)
Riga,  Latvia
NationalityLatvian
Alma materUniversity of Tartu
Scientific career
FieldsMathematics

He was born in 1865 in Walk, Livonia, in the family of a poor Baltic German merchant. In 1884, after graduating from a German school in Viljandi, he entered the faculty of physics and mathematics at the University of Tartu. In 1893 Bohl was awarded his Master's degree. This was for an investigation of quasi-periodic functions. The notion of quasi-periodic functions was generalised still further by Harald Bohr when he introduced almost-periodic functions. He has been the first to prove the three-dimensional case of the Brouwer fixed-point theorem, but his work was not noticed at the time.[1]

References
  1. Myskis, A. D.; Rabinovic, I. M. (1955). "Первое доказательство теоремы о неподвижной точке при непрерывном отображении шара в себя, данное латышским математиком П.Г.Болем" [The first proof of a fixed-point theorem for a continuous mapping of a sphere into itself, given by the Latvian mathematician P. G. Bohl]. Успехи математических наук (in Russian). 10 (3): 188–192.
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