Geir Ellingsrud [SEP] educated at
Geir Ellingsrud
Geir Ellingsrud (born 29 November 1948) is professor of mathematics at the University of Oslo, where he specialises in algebra and algebraic geometry.
He took the cand.real. degree at the University of Oslo in 1973, and the doctorate at Stockholm University in 1982. He was a lecturer at Stockholm University from 1982 to 1984, associate professor at the University of Oslo from 1984 to 1989, professor at the University of Bergen from 1989 to 1993 and at the University of Oslo since 1993. He has been
disagreed with the number obtained by Norwegian mathematicians Geir Ellingsrud and Stein Arild Strømme using ostensibly more rigorous techniques. Many mathematicians at the conference assumed that Candelas's work contained a mistake since it was not based on rigorous mathematical arguments. However, after examining their solution, Ellingsrud and Strømme discovered an error in their computer code and, upon fixing the code, they got an answer that agreed with the one obtained by Candelas and his collaborators.
In 1990, Edward Witten introduced topological string theory, a simplified version of string theory