This volume contains 32 papers by distinguished authors throughout the world who are friends or students of I.M. Gelfand. These essays cover a large spectrum of subjects including contact and symplectic geometry, singularities, complex geometry, Riemann surfaces, moduli spaces, Virasoro and Kac Moody Lie algebras, quantum groups, integral geometry, spinors and twistors, quantization and conformal quantum field theories, dynamical systems and chaos, semi-martingales, etc.
Simon Grigorevich Gindikin (Семён Григорьевич Гиндикин), born 7 December 1937 in Moscow, Russian SFSR, is a mathematician at Rutgers University who introduced the Gindikin–Karpelevich formula for the Harish-Chandra c-function.