Keywords : approximation
AL-Rafidain Journal of Computer Sciences and Mathematics,
2010, Volume 7, Issue 1, Pages 181-186
If and are convex subsets in , and in for all . If the approximation family is the set
An Infinitesimal approximation of an element in established in ,. A characterization of an infinitesimal approximation, necessary and sufficient conditions for the unique infinitesimal approximation are obtained.