V. Drensky et A. Giambruno, COCHARACTERS, CODIMENSIONS AND HILBERT SERIES OF THE POLYNOMIAL-IDENTITIES FOR 2X2 MATRICES WITH INVOLUTION, Canadian journal of mathematics, 46(4), 1994, pp. 718-733
Let M2(K,) be the algebra of 2 x 2 matrices with involution over a fi
eld K of characteristic 0. We obtain the exact values of the cocharact
ers, codimensions and Hilbert series of the -T-ideal of the polynomia
l identities for M2(K,).