ORTHOGONAL DECOMPOSITIONS AND IDEMPOTENT CONFIGURATIONS IN SEMISIMPLE ASSOCIATIVE ALGEBRAS

摘要

In 1981, A. I. Kostrikin acquainted the author with the so-called "Winnie-the-Pooh Problem," which became the source of all subsequent research. The problem is as follows. Let L be a simple Lie algebra over the complex number field C with Coxeter number h and Killing form (*∣*).