The area \(A\) of a square of side length \(s\) is \(A=s^2\text{.}\) Suppose \(s\) increases by an amount \(\Delta s=ds\text{.}\) Draw a square and then illustrate ...

This paper is a study of several problems of best approximation to a given function in a normed linear space from a convex subset of a finite-dimensional subspace. Specific problems treated are ...

SIAM Journal on Numerical Analysis, Vol. 29, No. 2 (Apr., 1992), pp. 439-451 (13 pages) An approximation to a linear differential inclusion by means of N-stage single step discrete inclusions is ...