Authors: Constantin Scheau
Comments: 8 pages.
The multi-space structure has been defined by Fl Smarandache as a union spaces with
some additional conditions hold. The mathematician L. Mao wrote a series of works in which he
introduces the concepts of multi-group, multi-ring, multivector - space etc. In  (Smarandache
Multi-Space Theory (I)), at open problems section, he suggests the introduction of a theory of
matrices and applications defined on the multi-linear spaces. This paper will give an example of
a multi-ring structure, introduces the notion of multi-matrix and defines the multi-matrix addition