Donald C. Spencer
Born
Donald Clayton Spencer

(1912-04-25)April 25, 1912
DiedDecember 23, 2001(2001-12-23) (aged 89)
Durango, Colorado, U.S.
Alma materUniversity of Colorado at Boulder
Massachusetts Institute of Technology
Trinity College, Cambridge[1]
Known forSpencer cohomology
Kodaira–Spencer map
Salem–Spencer set
AwardsBôcher Memorial Prize (1948)
National Medal of Science (1989)
Scientific career
InstitutionsPrinceton University
Doctoral advisorJ. E. Littlewood and G.H. Hardy
Doctoral studentsPierre Conner
Patrick X. Gallagher
Phillip Griffiths
Robert Hermann
Roger Horn
Louis Howard
Joseph J. Kohn
Suresh H. Moolgavkar

Donald Clayton Spencer (April 25, 1912 – December 23, 2001) was an American mathematician, known for work on deformation theory of structures arising in differential geometry, and on several complex variables from the point of view of partial differential equations. He was born in Boulder, Colorado, and educated at the University of Colorado and MIT.

Career

He wrote a Ph.D. in diophantine approximation under J. E. Littlewood and G.H. Hardy at the University of Cambridge, completed in 1939. He had positions at MIT and Stanford before his appointment in 1950 at Princeton University. There he was involved in a series of collaborative works with Kunihiko Kodaira on the deformation of complex structures, which had some influence on the theory of complex manifolds and algebraic geometry, and the conception of moduli spaces.

He also was led to formulate the d-bar Neumann problem, for the operator (see complex differential form) in PDE theory, to extend Hodge theory and the n-dimensional Cauchy–Riemann equations to the non-compact case. This is used to show existence theorems for holomorphic functions.

He later worked on pseudogroups and their deformation theory, based on a fresh approach to overdetermined systems of PDEs (bypassing the Cartan–Kähler ideas based on differential forms by making an intensive use of jets). Formulated at the level of various chain complexes, this gives rise to what is now called Spencer cohomology, a subtle and difficult theory both of formal and of analytical structure. This is a kind of Koszul complex theory, taken up by numerous mathematicians during the 1960s. In particular a theory for Lie equations formulated by Malgrange emerged, giving a very broad formulation of the notion of integrability.

Legacy

After his death, a mountain peak outside Silverton, Colorado was named in his honor.[2]

See also

Publications

References

  1. ^ Sylvia Nasar, 'Donald C. Spencer, 89, Pioneering Mathematician, Dies', The New York Times, 1 January 2002. [1]
  2. ^ Pankratz, Howard (2008-08-18). "Spencer peak added to Colorado mountain lexicon". Denver Post. Retrieved 2011-07-23.
  3. ^ Ahlfors, Lars V. (1955). "Review of Functionals of finite Riemann surfaces. By M. M. Schiffer and D. C. Spencer" (PDF). Bull. Amer. Math. Soc. 61 (6): 581–584. doi:10.1090/s0002-9904-1955-09998-1.
  4. ^ Allendoerfer, C. B. (1960). "Review of Advanced Calculus. By H. K. Nickerson, D. C. Spencer and N. E. Steenrod" (PDF). Bull. Amer. Math. Soc. 66 (3): 148–152. doi:10.1090/s0002-9904-1960-10411-9.