Aizik Isaakovich Vol'pert is a person. But not just any person, he is a special person who is very good at math. Imagine you are building a tower with blocks, and you need to know how many blocks you need to make it really tall. Aizik is like a super smart builder who knows how to figure out how many blocks you need, even if you want your tower to be super-duper tall. He also knows how to make really hard math problems easier to solve. So he is a pretty impressive person!