How to Define an Irregular Graph

Abstract

Click to increase image sizeClick to decrease image size Additional informationNotes on contributorsGary ChartrandI have lived in Michigan nearly all my life, having been brought up in Sault Ste. Marie, educated at Michigan State University, studying at the University of Michigan, and employed by Western Michigan University. I've enjoyed graph theory from the day I heard my eventual thesis advisor E. A. Nordhaus speak on it. I've had eleven doctoral students, the most recent being Ortrud Oellermann, and the two of us are now very pleased to have Erdös number 1. I enjoy musicals and many sports.Paul ErdösThe misfortune of birth overtook me on March 26, 1913. My parents were both mathematicians, and I learned a great deal from them. I got my Ph.D. at the University of Budapest in 1934. I spent the years 1938–1948 in Manchester, England, and I have been in the United States since 1954. I travel constantly around the world: Hungary, Israel, the U.S.A., England, etc. My subjects are number theory, combinatorics, set theory and probability.Ortrud R. OellermannI was born in Vryheid, South Africa, and have been interested in mathematics since childhood. After receiving my predoctoral degrees from the University of Natal in Durban, I came to the United States to study graph theory at Western Michigan University, where I received my Ph.D. in 1986, and where I am now on the faculty. I enjoy playing the piano, violin and recorder. I speak German, Afrikaans and Zulu, in addition to English.