of sole ulcers recorded in farm one (9%) and 125 cases of white line disease recorded in farm two (6.94%). Annual incidence of 15.94% recorded for these two lesions. In farm two, 56 cases of sole ulcer (5.09) and 208 cases of white line disease (18...

We show ¯rst that for each C*-algebra A, contractibility of A implies

contractibility of Mn(A).

We next prove that an incidence algebra A of upper triangular matrices, de¯ned by a

partially ordered set ­ on f1; 2; : : : ; ng...