In memory of Victoria Kreps (3 September 1945-3 March 2021). - Anna Bogomolnaia; Misha Gavrilovich; Egor Ianovski; Galina Lyapunova; Hervé Moulin 001; Alexander S. Nesterov; Marina Sandomirskaia; Fedor Sandomirskiy; Elena Yanovskaya (Int. J. Game Theory, 2021)