A new application of random matrices: Ext(C<sub>red</sub><sup>โ</sup>(F<sub>2</sub>)) is not a group
A new application of random matrices: Ext(C<sub>red</sub><sup>โ</sup>(F<sub>2</sub>)) is not a group
In the process of developing the theory of free probability and free entropy, Voiculescu introduced in 1991 a random matrix model for a free semicircular system.Since then, random matrices have played a key role in von Neumann algebra theory (cf.[V8], [V9]).The main result of this paper is the following extension โฆ