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Jenny Harrison is a professor of mathematics at the University of California, Berkeley.

Education and career

Harrison grew up in Tuscaloosa, Alabama. On graduating from the University of Alabama, she won a Marshall Scholarship which she used to fund her graduate studies at the University of Warwick.^[1] She completed her doctorate there in 1975, supervised by Christopher Zeeman.^[1] Hassler Whitney was her postdoctoral adviser at the Institute for Advanced Study, and she was also one of the Miller Research Fellows at Berkeley.^[1] She taught at the University of Oxford (Somerville College) from 1978 to 1981, before returning to Berkeley as an assistant professor.

In 1986, after being denied tenure at Berkeley, Harrison filed a lawsuit based on gender discrimination. Stephen Smale and Robion Kirby were the most vocal opponents to her receiving tenure during the case, while Morris Hirsch and James Yorke were her most vocal supporters. The 1993 settlement led to a new review of her work by a panel of seven mathematicians and science faculty who unanimously recommended tenure as a full professor.^[2]^[3]

Research contributions

Harrison specializes in geometric analysis and areas in the intersection of algebra, geometry, and geometric measure theory. She introduced and developed with collaborators a theory of generalized functions called differential chains^[4]^[5] that unifies an infinitesimal calculus with the classical theory of the smooth continuum, a long outstanding problem. The infinitesimals are constructive and arise from methods of standard analysis, as opposed to the nonstandard analysis of Abraham Robinson. The methods apply equally well to domains such as soap films, fractals, charged particles, and Whitney stratified spaces, placing them on the same footing as smooth submanifolds in the resulting calculus. The results include optimal generalizations and simplifications of the theorems of Stokes, Gauss and Green. She has pioneered applications of differential chains to the calculus of variations, physics, and continuum mechanics. Her solution to Plateau's problem^[6] is the first proof of existence of a solution to a universal Plateau’s problem for finitely many boundary curves, taking into account all soap films arising in nature, including nonorientable films with triple junctions, as well as solutions of Jesse Douglas,^[7] Herbert Federer and Wendell Fleming.^[8] Recently, she and Harrison Pugh have announced existence and soap film regularity of a solution to a universal Plateau's problem for codimension one surfaces using Hausdorff measure to define area.

As a graduate student at the University of Warwick, where Zeeman introduced her to Plateau's problem. She found a counterexample to the Seifert conjecture^[9] at Oxford. In a Berkeley seminar in 1983 she proposed the existence of a general theory linking these together, and the theory of differential chains began to evolve. Jenny Harrison and Harrison Pugh proved that the topological vector space of differential chains satisfies a universal property determined by two natural axioms.^[5] They have used the theory to provide the first universal solution to Plateau's problem, including soap film regularity, building upon Harrison's earlier paper.^[10] Recently, Fried and Seguin have found a broad generalization to Reynolds transport theorem using the methods of differential chains.^[11]

Awards and fellowships

References

1. ^{{mathgenealogy|id=32887}}
2. ^¹²{{citation|url=http://articles.latimes.com/1993-05-02/magazine/tm-30007_1_jenny-harrison|title=The Mathematics of Discrimination : Since 1986, Jenny Harrison has been fighting for tenure in the male-dominated UC Berkeley math department. She says it's a matter of sexual discrimination; the university says she's just not good enough|newspaper=Los Angeles Times|date=May 2, 1993|first=Margy|last=Rocklin}}.
3. ^{{citation|first=Allyn|last=Jackson|title=Fighting for Tenure: The Jenny Harrison Case Opens Pandora's Box of Issues About Tenure, Discrimination, and the Law|url=http://www.awm-math.org/articles/notices/199403/jackson/index.html|journal=Notices of the American Mathematical Society|volume=41|issue=3|date=March 1994|pages=187–194}}.
4. ^ Jenny Harrison, Operator calculus of differential chains and differential forms, to appear in the Journal of Geometric Analysis, arxiv posting January 2011, 89 pages
5. ^¹J. Harrison and H. Pugh, Topological Aspects of Differential Chains, Journal of Geometric Analysis, 22 (2012), no. 3, 685–690
6. ^[https://link.springer.com/article/10.1007/s12220-012-9337-x] Jenny Harrison, Soap film solutions to Plateau's problem, Journal of Geometric Analysis, January 2014, 24(1):271-2972
7. ^Jesse Douglas, Solutions of the problem of Plateau, Transactions of the American Mathematical Society 33(1931), 263–321
8. ^Herbert Federer and Wendell Fleming, Normal and integral currents, The Annals of Mathematics 72 (1960), no. 3, 458–520
9. ^Jenny Harrison,

counterexamples to the Seifert conjecture. Topology (journal)|Topology, vol. 27, no. 3, pp. 249–278, 1988
10. ^Jenny Harrison, Journal of Geometric Analysis, January 2013, 24(1):271-297
11. ^Eliot Fried and Brian Seguin, Mathematical Models and Methods in Applied Sciences, Vol. 24, No. 9 (2014) 1729–1779

External links