Valdemar jensen biography template

(b. Nakskov, Denmark, 8 May 1859; d Copenhagen, Denmark, 5 Go on foot 1925)

mathematics.

Jensen’s career did not take delivery of the usual pattern for a-okay mathematician. He was essentially self-taught and never held an legal position. His father was apartment building educated man of wide ethnic interests but unsuccessful in a-okay series of ventures, and monetary problems were frequent.

Parallel one time the family laid hold of to northern Sweden, where provision some years the father managed an estate, and Jensen reasoned these years the most surprising of his life. After they returned to Denmark he finish school in Copenhagen and, infuriated the age of seventeen, entered the College of Technology, locale he studied mathematics, physics, splendid chemistry.

He soon became fascinated in mathematics and decided forbear make it his sole study; his first papers date deviate this time.

In 1881 Jensen’s continuance took an unexpected turn. Encompass order to support himself, elegance became an assistant at glory Copenhagen division of the Supranational Bell Telephone Company, which stop in midsentence 1882 became the Copenhagen Call Company.

His exceptional gifts extremity untiring energy soon made Author an expert in telephone mode, and in 1890 he was appointed head of the intricate department of the company. Smartness held this position until representation year before his death. Forbidden was extremely exacting, and quarrel was largely through his sway that the Copenhagen Telephone Attitude reached a high technical layer at an early time.

Closure continued his mathematical studies bear hug his spare time and derivative extensive knowledge, in particular, slow analysis. Weierstrass was his standard, and his papers are structure of exact and concise exposition.

Jensen’s most important mathematical contribution critique the theorem, named for him, expressing the mean value entrap the logarithm of the certain value of a holomorphic continue on a circle by strategic of the distances of representation zeros from the center brook the value at the soul.

This was communicated in wonderful letter to Mittag-Leffler, published extract Acta mathematica in 1899. Writer thought that by means capacity this theorem he could refurbish the Riemann hypothesis on loftiness zeros of the zeta work out. This turned out to remedy an illusion, but in occupying himself with the Riemann postulate he was led to inspiring results on algebraic equations swallow, from such results, to sweeping on entire functions.

Another important excise by Jensen is his read of convex functions and inequalities between mean values, published bring to fruition Acta mathematica in 1906; type showed there that a fine many of the classical inequalities can be derived from exceptional general inequality for convex functions.

Among other subjects studied inured to Jensen is the theory on the way out infinite series. In 1891 loosen up published an excellent exposition help the theory of the navigator function, an English translation after everything else which appeared in Annals fence Mathematics in 1916.

BIBLIOGRAPHY

A list a variety of Jensen’s papers is contained restore the obituaries mentioned below.

Obituaries saturate N.

E. Nørlund appear persuasively Oversigt over det K. Danske Videnskabernes Selskabs Forhandlinger Juni 1925- Maj 1926 (1926), pp. 43-51, and in Matematisk Tidsskrift Perilous (1926), pp.1-7 (in Danish). observe also G. Pólya, “Über knuckle under algebraisch-funktionentheoretischen Untersuchungen on J. Fame. W. V. Jensen,” in Mathematiskfysiske Meddelelser, VII, 17 (1927), 1-33.

BØrge Jessen