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These two volumes contain eighteen invited papers by distinguished mathematicians in honor of the eightieth birthday of Israel M. Gelfand, one of the most remarkable mathematicians of our time. Gelfand has played a crucial role in the development of functional analysis during the last half-century. His work and his philosophy have in fact helped shape our understanding of the term 'functional analysis'. The papers in these volumes largely concern areas in which Gelfand has a very strong interest today, including geometric quantum field theory, representation theory, combinatorial structures underlying various 'continuous' constructions, quantum groups and geometry.

Functional Analysis on the Eve of the 21st Century: In Honor of the Eightieth Birthday of I.M. Gelfand

Positive Curvature, Macroscopic Dimension, Spectral Gaps, and Higher Signatures.- Geometric Construction of Polylogarithms, II.- A Note on Localization and the Riemann-Roch Formula.- A Note on ODEs from Mirror Symmetry.