Erik erikson theory

Where was erik erikson born

He was essentially self-taught and never held an academic position. His father was an educated man of wide cultural interests but unsuccessful in a series of ventures, and pecuniary problems were frequent. At one time the family moved to northern Sweden, where for some years the father managed an estate, and Jensen considered these years the most wonderful of his life.

After they returned to Denmark he finished school in Copenhagen and, at the age of seventeen, entered the College of Technology, where he studied mathematics, physics, and chemistry. He soon became absorbed in mathematics and decided to make it his sole study; his first papers date from this time. In order to support himself, he became an assistant at the Copenhagen division of the International Bell Telephone Company, which in became the Copenhagen Telephone Company.

His exceptional gifts and untiring energy soon made Jensen an expert in telephone technique, and in he was appointed head of the technical department of the company. He held this position until the year before his death. He was extremely exacting, and it was largely through his influence that the Copenhagen Telephone Company reached a high technical level at an early time.

He continued his mathematical studies in his spare time and acquired extensive knowledge, in particular, of analysis. Weierstrass was his ideal, and his papers are patterns of exact and concise exposition. This was communicated in a letter to Mittag-Leffler, published in Acta mathematica in Jensen thought that by means of this theorem he could prove the Riemann hypothesis on the zeros of the zeta function.

This turned out to be an illusion, but in occupying himself with the Riemann hypothesis he was led to interesting results on algebraic equations and, from such results, to generalizations on entire functions. Another important contribution by Jensen is his study of convex functions and inequalities between mean values, published in Acta mathematica in ; he showed there that a great many of the classical inequalities can be derived from a general inequality for convex functions.

Among other subjects studied by Jensen is the theory of infinite series. In he published an excellent exposition of the theory of the gamma function, an English translation of which appeared in Annals of Mathematics in