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The closed ball with center x and radius r is defined by B_r(x)={y:|y-x|<=r}.

In the plane, a closed curve is a curve with no endpoints and which completely encloses an area.

A compact manifold without boundary.

The set closure St^_v of a star Stv at a vertex v of a simplicial complex K.

A subset of a topological group which is closed as a subset and also a subgroup.

Let p be a non-wandering point of a diffeomorphism S:M->M of a compact manifold. The closing lemma concerns if S can be arbitrarily well approximated with derivatives of ...

The clove hitch is the hitch illustrated above that is also called the boatman's knot or peg knot.

Given a point lattice, a cluster is a group of filled cells which are all connected to their neighbors vertically or horizontally.

In 1976, Coates and Wiles showed that elliptic curves with complex multiplication having an infinite number of solutions have L-functions which are zero at the relevant fixed ...

A coaxal system is a system of coaxal circles. A spectacular example is the set of circles (circumcircle, nine-point circle, orthocentroidal circle, orthoptic circle of the ...