Elias M. Stein

Elias Menachem Stein (January 13, 1931 – December 23, 2018) was a Belgian-born, American mathematician who was a leading figure in the field of harmonic analysis. In 1999 he shared the Wolf Prize in Mathematics with Laszlo Lovasz.

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Quotes

That geometric considerations enter in a decisive way in many questions of harmonic analysis is by now a well-known fact. In explicit form such ideas arose first in the estimation of the Fourier transform of surface-carried measure; they have since played a key role in averages over lower-dimensional varieties, restriction theorems, in connection with the study of oscillatory integrals and Fourier integral operators, and in application to linear and non-linear dispersive equations.
"Some Geometrical Concepts Arising in Harmonic Analysis by Elias M. Stein". Visions in Mathematics: GAFA 2000 Special Volume, Part I pp. 1-453. Modern Birkhäuser Classics. Birkhäuser Basel. 2010. pp. 434-453. doi:10.1007/978-3-0346-0422-2_17. (edited by Noga Alon, Jean Bourgain, Alain Connes, Misha Gromov, and Vital D. Milman; quote from p. 434)

What I like about mathematics is the interplay with other people. And that generates extra energy — because it really helps you think.
- (30 January 2015)"Science Lives: Elias Stein". Simons Foundations, YouTube. (quote at 2:22 of 3:01 in video)

Working with Eli Stein is amazing. There are good teachers and there are great teachers — and then there is Eli. He was simply the best teacher, I believe, of advanced math, I believe, in the whole world, by far. ... he conveyed a spirit of optimism. ... He has a wonderful style of explaining math — in which almost all of the effort of explanation goes into finding the right point of view and getting the essence of the problem.
- Charles Fefferman, (28 September 2023)"Interview with Charles Fefferman by Duván Cardona". ICMAM Latin America 2023, YouTube. (quote at 4:23 of 14:15 in video)