We discuss the proposed description of configurations with four-branes
and six-branes in M(atrix) theory. Computing the velocity dependent p
otential between these configurations and gravitons and membranes, we
show that they agree with the short distance string results computed i
n type IIA string theory. Due to the ''closeness'' of these configurat
ion to a supersymmetric configuration the M(atrix) theory reproduces t
he correct long distance behavior. (C) 1998 Elsevier Science B.V.