New 21-st edition of the “Kourovka Notebook (Unsolved Problems in Group Theory)”

“Kourovka Notebook” is a famous collection of open problems in group theory proposed by hundreds of mathematicians from all over the world. It has been published every 2-4 years since 1965. The latest 21st edition (editors Evgeny Khukhro and Victor Mazurov) has just been published, which contains 150 new problems and a number of comments on problems from the previous editions. Perhaps the most striking illustration of the success of “Kourovka Notebook” is the fact that more than 3/4 of the problems from the first and second issues have now been solved!