FANDOM


A manifold is a topological space with the property that every point's neighbourhood is homeomorphic to Euclidean space's. Informally, this means that when you "zoom in" on a point, the space around said point will eventually become indistinguishable to a Euclidean space. Examples of basic types of manifold are listed below.

0-manifolds are created from disjoint unions of 1 or more points, and are classified by their cardinality. Examples of 0-manifolds include the point, the point pair (0D hypersphere), the point triplet, and the natural line (along with other lines constructed from countable sets).

1-manifolds are also known as curves, and they are created from deforming, stretching, or taking disjoint unions of circles or real lines. Examples of 1-manifolds (excluding the aforementioned) include the open interval, circle pair, ellipse, parabola, hyperbola, cubic curve, real projective line, and the long line.

2-manifolds are also known as surfaces. They can be (deformed) subsets of a Euclidean plane, but they do not have to be. Examples of 2-manifolds include the Euclidean plane, hyperbolic plane, open disc, sphere, torus, double torus, real projective plane, Klein bottle, tube, and the Möbius strip.

Examples of 3-manifolds include the Euclidean realm, hyperbolic realm, glome, ditorus, hollow spheritorus, hollow torisphere, open ball, solid torus, and the solid double torus.

Examples of 4-manifolds include the Euclidean flune, hyperbolic flune, tetrasphere, open gongol, exotic flune, solid ditorus, spheritorus, torisphere, tiger, and the fake gongol.

Community content is available under CC-BY-SA unless otherwise noted.