Closed Ball

Some articles on closed, closed ball, ball:

CW Complex - Formulation
... An n-dimensional closed cell is the image of an n-dimensional closed ball under an attaching map ... For example, a simplex is a closed cell, and more generally, a convex polytope is a closed cell ... An n-dimensional open cell is a topological space that is homeomorphic to the open ball ...
Glossary Of Topology - C
... Clopen set A set is clopen if it is both open and closed ... Closed ball If (M, d) is a metric space, a closed ball is a set of the form D(x r) = {y in M d(x, y) ≤ r}, where x is in M and r is a positive real number, the radius of the ball ... A closed ball of radius r is a closed r-ball ...

Famous quotes containing the words ball and/or closed:

    Knowing what you can not do is more important than knowing what you can do. In fact, that’s good taste.
    —Lucille Ball (1911–1989)

    One man’s observation is another man’s closed book or flight of fancy.
    Willard Van Orman Quine (b. 1908)