Mathematician:Øystein Ore

Norwegian mathematician whose work was mainly in graph theory, although also known for his work in ring theory and Galois theory.

One of the early founders of lattice theory.

Also known for writing and editing several books, including a few on various aspects of the history of mathematics.

Nationality
Norwegian

History

 * Born: 7 October 1899, Oslo, Norway
 * Died: 13 August 1968, Oslo, Norway

Theorems and Definitions

 * Ore Condition
 * Ore Extension
 * Ore Harmonic Number
 * Ore's Theorem

Books and Papers

 * 1924: Zur Theorie der algebraischen Körper (Ph.D. thesis)
 * 1930: Collected Works of Richard Dedekind (3 vols, ed. jointly with )
 * 1934: Les Corps Algébriques et la Théorie des Idéaux
 * 1936: L'Algèbre Abstraite
 * 1948: Number Theory and its History
 * 1953: Cardano, the Gambling Scholar
 * 1957: Niels Henrik Abel, Mathematician Extraordinary
 * 1962: Theory of Graphs
 * 1963: Graphs and Their Uses
 * 1967: The Four-Color Problem
 * 1969: Invitation to Number Theory