Joel Hass
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Joel Hass
Joel Hass is an American mathematician, a professor of mathematics and chair of the mathematics department at the University of California, Davis.[1]
Biography
Hass received his Ph.D. from the University of California, Berkeley in 1981 under the supervision of Robion Kirby.[2] He joined the Davis faculty in 1988.[1]
In 2012 he became a fellow of the American Mathematical Society.[3]
Research contributions
Hass is known for proving the equal-volume special case of the double bubble conjecture,[4] for proving that the unknotting problem is in NP,[5] and for giving an exponential bound on the number of Reidemeister moves needed to reduce the unknot to a circle.[6]
Selected publications
- Freedman, Michael; Hass, Joel; Scott, Peter (1983), "Least area incompressible surfaces in $3$-manifolds", Inventiones Mathematicae 71 (3): 609–642, doi:10.1007/BF02095997, MR 695910.
- Hass, Joel; Lagarias, Jeffrey C.; Pippenger, Nicholas (1999), "The computational complexity of knot and link problems", Journal of the ACM 46 (2): 185–211, arXiv:math/9807016, doi:10.1145/301970.301971.
- Hass, Joel; Schlafly, Roger (2000), "Double bubbles minimize", Annals of Mathematics. Second Series 151 (2): 459–515, doi:10.2307/121042, MR 1765704.
- Hass, Joel; Lagarias, Jeffrey C. (2001), "The number of Reidemeister moves needed for unknotting", Journal of the American Mathematical Society 14 (2): 399–428, doi:10.1090/S0894-0347-01-00358-7, MR 1815217.
References
- ↑ 1.0 1.1 Faculty profile and math department contact information, UC Davis, retrieved 2012-07-03.
- ↑ Joel Hass at the Mathematics Genealogy Project
- ↑ List of Fellows of the American Mathematical Society, retrieved 2013-01-19.
- ↑ Hass & Schlafly (2000).
- ↑ Hass, Lagarias & Pippenger (1999).
- ↑ Hass & Lagarias (2001).
External links
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