Under the assumption of the
existence of a weak solution and the pathwise uniqueness of solutions, existence and
uniqueness of a strong solution to the stochastic differential system of non Markovian
type in the plane
dXz
= α(z,X)dBz+ β(z,X)dz for z ∈ R+2,
∂X
= x
is obtained where x is a continuous real valued function on ∂R+2.