By Arieh Iserles

Acta Numerica has confirmed itself because the major discussion board for the presentation of definitive stories of numerical research issues. Highlights of this year's factor comprise articles on sequential quadratic programming, mesh adaption, unfastened boundary difficulties, and particle equipment in continuum computations. The invited papers will permit researchers and graduate scholars alike to quick seize the present traits and advancements during this box.

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**Extra resources for Acta Numerica 1995: Volume 4 (v. 4)**

**Sample text**

13. 9 to compact sets in a topological space. 14. 10 to compact sets in a topological space. 15. Let (X, dX ) and (Y, dY ) be metric spaces (and hence a topological space). 8 coincide. 16. 4 is extended to topological spaces, that (a) implies (b). 5 is extended to topological spaces, that (a), (c), (d) are all equivalent to each other, and imply (b). 17. 2 to compact sets in a topological space.

Proof. 3. 1. 8. 2. 10. 3. 15. 4. Let (X, d) be a metric space, x0 be a point in X, and r > 0. Let B be the open ball B := B(x0 , r) = {x ∈ X : d(x, x0 ) < r}, and let C be the closed ball C := {x ∈ X : d(x, x0 ) ≤ r}. (a) Show that B ⊆ C. (b) Give an example of a metric space (X, d), a point x0 , and a radius r > 0 such that B is not equal to C. 3 Relative topology When we deﬁned notions such as open and closed sets, we mentioned that such concepts depended on the choice of metric one uses. ). However, it is not just the choice of metric which determines what is open and what is not - it is also the choice of ambient space X.

If (X, d) is a metric space, x ∈ X, and r > 0, then B(x, r) is a neighbourhood of x. 4 (Topological convergence). Let m be an integer, (X, F) be a topological space and let (x(n) )∞ n=m be a sequence of points in X. Let x be a point in X. We say that (x(n) )∞ n=m converges to x if and only if, for every neighbourhood V of x, there exists an N ≥ m such that x(n) ∈ V for all n ≥ N . 2). 20). 4. 5 (Interior, exterior, boundary). Let (X, F) be a topological space, let E be a subset of X, and let x0 be a point in X.