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An n-manifold which cannot be "nontrivially" decomposed into other n-manifolds.

A type II Markov move.

The measurable space (S^',S^') into which a random variable from a probability space is a measurable function.

A real-linear vector space H equipped with a symplectic form s.

A vector field is a section of its tangent bundle, meaning that to every point x in a manifold M, a vector X(x) in T_xM is associated, where T_x is the tangent space.

The Reidemeister move of type I.

Half a zip-pair.

An h-cobordism is a bordism W between two manifolds M_1 and M_2 such that W is simply connected and the inclusion maps M_1->W and M_2->W are homotopy equivalences.

n-dimensional Euclidean space.

The figure eight knot, also known as the Flemish knot and savoy knot, is the unique prime knot of four crossings 04-001. It has braid word ...