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Jenny Harrison

Jenny Harrison is a professor of mathematics at UC Berkeley. She 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 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 is the first proof of existence of a solution in a category with a continuous boundary operator and that contains representatives of all soap films, as well as solutions of Jesse Douglas, Herbert Federer and Wendell Fleming.

Harrison grew up in Tuscaloosa, Alabama. Her graduate studies were at the University of Warwick, where her adviser E.C. Zeeman introduced her to Plateau's problem. Hassler Whitney was her postdoctoral adviser at the Institute for Advanced Study. She found a counterexample to the Seifert conjecture while on the faculty at Oxford University. 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 recently proved that the theory of differential chains is distinct from the theory of Schwartz distributions and de Rham currents, settling a question posed by Michael Atiyah in 1996. Furthermore, their paper shows the topological vector space of differential chains satisfies a universal property determined by three natural axioms.

Gender discrimination lawsuit

Harrison initiated a lawsuit based on gender discrimination in the 1986 tenure decision by the Berkeley mathematics department. The case attracted international attention. 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. The review included her generalization of Stokes' theorem to nonsmooth domains. 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.

References

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External links

• Harrison's webpage

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