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A type of flow technically defined in terms of the tangent bundle of a manifold.

A one-dimensional geometric object such as a pencil or line segment range.

If a Sylow 2-subgroup T of G lies in a unique maximal 2-local P of G, then P is a "strongly embedded" subgroup of G, and G is known.

A sphere which acts as a model of a spherical (or ellipsoidal) celestial body, especially the Earth, and on which the outlines of continents, oceans, etc. are drawn.

A metric characterizing the difference between two knots K and K^' in S^3.

A graded algebra over the integers Z. Cohomology of a space is a graded ring.

The index set for the collection of submodules in a graded module.

There exists no known P algorithm for graph isomorphism testing, although the problem has also not been shown to be NP-complete. In fact, the problem of identifying ...

An orientation of an undirected graph G is an assignment of exactly one direction to each of the edges of G. Only connected, bridgeless graphs can have a strong orientation ...

An element of order 2 in a group (i.e., an element A of a group such that A^2=I, where I is the identity element).