On semigroups of normal matricesZalar, Bojana (Avtor) mathematicsmatrix theorynormal matricesspectrumsemigroupsreducabilitySemigroups of normal complex square matrices having a finite spectrum are studied. It is shown that every mamber ▫$A$▫ of such a semigroup satisfies the condition ▫$A^ast = A^n$▫, where ▫$n$▫ does not depend on the matrix ▫$A$▫. Further, it is shown that such a semigroup is completely reducible, and each irreducible contraction consists of a group of unitary matrices and, aventually, the zero matrix.20032012-06-01 11:57:46Neznano27669UDK: 512.643COBISS_ID: 7944470ISSN pri članku: 0024-3795NUK URN: URN:SI:UM:DK:R5BPSTRQsl