29 June 1951 |
Heidelberg, West Germany
|Institutions||Max Planck Institute for Mathematics
Collège de France
University of Maryland
|Alma mater||University of Bonn|
|Doctoral advisor||Friedrich Hirzebruch|
|Doctoral students||Svetlana Katok
|Known for||Gross–Zagier theorem
|Notable awards||Chauvenet Prize (2000)|
Don Bernard Zagier (born 29 June 1951) is an American mathematician whose main area of work is number theory. He is currently one of the directors of the Max Planck Institute for Mathematics in Bonn, Germany. He has been a professor at the Collège de France in Paris, France from 2006 to 2014. Since October 2014, he is also a Distinguished Staff Associate at ICTP. 
He was born in Heidelberg, West Germany. His mother was a psychiatrist, and his father was the dean of instruction at the American College of Switzerland. His father held five different citizenships, and he spent his youth living in many different countries. After finishing high school (at age 13) and attending Winchester College for a year, he studied for three years at M.I.T., completing his bachelor's and master's degrees and being named a Putnam Fellow in 1967 at the age of 16. He then wrote a doctoral dissertation on characteristic classes under Friedrich Hirzebruch at Bonn, receiving his PhD at 20. He received his Habilitation at the age of 23, and was named professor at the age of 24.
He collaborated with Hirzebruch in work on Hilbert modular surfaces. Hirzebruch and Zagier coauthored Intersection numbers of curves on Hilbert modular surfaces and modular forms of Nebentypus, where they proved that intersection numbers of algebraic cycles on a Hilbert modular surface occur as Fourier coefficients of a modular form. Stephen Kudla, John Millson and others generalized this result to intersection numbers of algebraic cycles on arithmetic quotients of symmetric spaces.
One of his results is a joint work with Benedict Gross (the so-called Gross–Zagier formula). This formula relates the first derivative of the complex L-series of an elliptic curve evaluated at 1 to the height of a certain Heegner point. This theorem has some applications including implying cases of the Birch and Swinnerton-Dyer conjecture along with being an ingredient to Dorian Goldfeld's solution of the class number problem. As a part of their work, Gross and Zagier found a formula for norms of differences of singular moduli. Zagier later found a formula for traces of singular moduli as Fourier coefficients of a weight 3/2 modular form.
Zagier found a formula for the value of the Dedekind zeta function of an arbitrary number field at s = 2 in terms of the dilogarithm function, by studying arithmetic hyperbolic 3-manifolds. He later formulated a general conjecture giving formulas for special values of Dedekind zeta functions in terms of polylogarithm functions.
- Zagier, D. (1990), "A One-Sentence Proof That Every Prime p ≡ 1 (mod 4) Is a Sum of Two Squares", The American Mathematical Monthly (Mathematical Association of America) 97 (2): 144, doi:10.2307/2323918, JSTOR 2323918. The First 50 Million Prime Numbers." Math. Intel. 0, 221–224, 1977.
- (with F. Hirzebruch) "Intersection numbers of curves on Hilbert modular surfaces and modular forms of Nebentypus" Invent. Math. 36 (1976) 57-113
- Hyperbolic manifolds and special values of Dedekind zeta functions Invent. Math. 83 (1986) 285-302
- (with B. Gross) Singular moduli J. reine Angew. Math. 355 (1985) 191-220
- (with B. Gross) Heegner points and derivative of L-series Invent. Math. 85 (1986) 225-320
- (with J. Harer) The Euler characteristic of the moduli space of curves Invent. Math. 85 (1986) 457-485
- (with B. Gross and W. Kohnen) Heegner points and derivatives of L-series. II Math. Annalen 278 (1987) 497-562
- The Birch-Swinnerton-Dyer conjecture from a naive point of view in Arithmetic Algebraic Geometry (G. v.d. Geer, F. Oort, J. Steenbrink, eds.), Prog. in Math. 89, Birkhäuser, Boston (1990) 377-389
- Polylogarithms, Dedekind zeta functions, and the algebraic K-theory of fields in Arithmetic Algebraic Geometry (G. v.d. Geer, F. Oort, J. Steenbrink, eds.), Prog. in Math. 89, Birkhäuser, Boston (1990) 391-430
- ICTP News Item
- http://www.math.unh.edu/~dvf/532/Zagier [broken link, last seen on 2/2012: http://web.archive.org/web/20120205194801/http://www.math.unh.edu/~dvf/532/Zagier]
- Frank Nelson Cole Prize in Number Theory, American Mathematical Society. Accessed March 17, 2010
- Zagier Receives Von Staudt Prize. Notices of the American Mathematical Society, vol. 48 (2001), no. 8, pp. 830–831
- Biography from the webpage of the Max Planck Society
- Don Zagier at the Mathematics Genealogy Project