Ivan Fesenko | |
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Born | St Petersburg, Russia |
Fields | Mathematician |
Institutions | University of Nottingham |
Alma mater | Saint Petersburg State University |
Known for | number theory, class field theory, higher class field theory, zeta functions and integrals, adelic analysis and geometry |
Notable awards | Petersburg Mathematical Society Prize (1992) |
Ivan Fesenko is a mathematician working in number theory and other areas of mathematics. In 1992 Fesenko won the Young Mathematician Prize of the Petersburg Mathematical Society for his work on class field theory.[1]
Ivan Fesenko extended and generalized several core theories for one-dimensional objects in algebraic number theory to their higher-dimensional version for arithmetic schemes, inventing new mathematical objects and theories.
In class field theory Fesenko constructed an explicit class field theory for complete objects associated to arithmetic schemes,[2][3] which is part of higher class field theory where Milnor K-groups of the fields play a central role. He developed an explicit class field theory theory for local fields with perfect and imperfect residue field.[4][5] Fesenko initiated a "noncommutative local class field theory" for arithmetically profinite Galois extensions of local fields[6] which relates quotients of the field of norms with the Galois group via a 1-cocycle. He is a coauthor of a popular textbook on local fields[7] and a coeditor of a volume on higher local fields.[8]
Generalizing the Haar measure and integration to non locally compact objects associated to arithmetic schemes, Fesenko invented a translation invariant measure, integration and Fourier transform on higher-dimensional local fields.[9] Extending the theory of geometric adele rings associated to arithmetic surfaces he introduced analytic adelic objects associated to rank two integral structures and developed the theory of measure and integration on them.[10]
Fesenko pioneered the study of zeta functions of arithmetic surfaces using zeta integrals. He introduced zeta integrals on arithmetic schemes of dimension two, generalized Tate's thesis and proved a two-dimensional version which reduces the study of the zeta function to the study of geometric and analytic properties of adelic spaces.[11] His theory relates adelic dualities and measure theoretical and topological properties of quotients of adelic spaces with fundamental properties of the zeta functions.