| Bjarni Jónsson | |
| Birth Date: | February 15, 1920 |
| Birth Place: | Dragháls, Iceland |
| Death Place: | Cincinnati, Ohio, U.S. |
| Nationality: | Icelandic |
| Fields: | Mathematics, logic |
| Workplaces: | Brown University Vanderbilt University University of Minnesota, Minneapolis |
| Alma Mater: | University of California, Berkeley |
| Doctoral Advisor: | Alfred Tarski |
| Doctoral Students: | Frederick Galvin |
| Known For: | Jónsson's lemma, Jónsson algebras, ω-Jónsson functions, Jónsson cardinals, Jónsson terms, Jónsson–Tarski algebras, Jónsson–Tarski duality |
Bjarni Jónsson (February 15, 1920 – September 30, 2016)[1] was an Icelandic mathematician and logician working in universal algebra, lattice theory, model theory and set theory. He was emeritus distinguished professor of mathematics at Vanderbilt University and the honorary editor in chief of Algebra Universalis. He received his PhD in 1946 at UC Berkeley under supervision of Alfred Tarski.[2]
In 2012, he became a fellow of the American Mathematical Society.[3]
Jónsson's lemma as well as several mathematical objects are named after him, among them Jónsson algebras, ω-Jónsson functions, Jónsson cardinals, Jónsson terms, Jónsson–Tarski algebras and Jónsson–Tarski duality.