On the work of E. B. Dynkin in the theory of Lie groups by F. I. Karpelevich, A. L. Onishchik, and E. B. Vinberg Matrix Vieta theorem by D. Fuchs and A. Schwarz Integral geometry on real quadrics by S. Gindikin Dynkin diagrams in singularity theory by S. M. Gusein-Zade Variations on the triangular theme by A. A. Kirillov Vector fields and deformations of isotropic super-Grassmannians of maximal type by A. L. Onishchik and A. A. Serov $A_\infty$ algebras and the cohomology of moduli spaces by M. Penkava and A. Schwarz On Hamburger's theorem by I. Piatetski-Shapiro and R. Raghunathan An analogue of M. Artin's conjecture on invariants for nonassociative algebras by V. L. Popov On reductive algebraic semigroups by E. B. Vinberg Crystal bases and the problem of reduction in classical and quantum modules by D. P. Zhelobenko.