This paper proposes a new generalized Seikkala derivative (gS-derivative) of
a fuzzy-valued function. We see that, there are many elementary fuzzy-valued
functions which occur frequently as solution of fuzzy differential equation,
are not Seikkala differentiable but they are generalized Seikkala
differentiable. We discuss some of the properties of proposed
differentiability. Using gS-differentiability, we find the solution of fuzzy
initial value problem.Comment: Submitted to the journa