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DEFINITIONS AND EXAMPLES FROM POINT SET TOPOLOGY A
DEFINITIONS AND EXAMPLES FROM POINT SET TOPOLOGY A

... first is the discrete topology, in which we take τ = P(X). The second is the trivial topology, in which we take τ = {∅, X}. (2) If (X, d) is a metric space then the collection of open balls in X generates a topology called the metric topology. As a matter of definition, note that when we say that th ...
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... Then f (τ ) 6= f (a) for some τ ∈ [a, b]. But the Intermediate Value Theorem then ensures that, given any real number c between f (a) and f (τ ), there would exist some t ∈ [a, τ ] for which f (t) = c. But this is clearly impossible, since f is integer-valued. Thus f must be constant on [a, b]. We n ...
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... Definition 1.10. Let (X, τ ) and (Y, σ) be topological spaces. A map f : X → Y is called continuous if for each open subset V of Y , the preimage f −1 (V ) is an open subset of X. This definition coincides with the usual definition of continuity for maps between Euclidean spaces. We invite the inter ...
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Manifold



In mathematics, a manifold is a topological space that resembles Euclidean space near each point. More precisely, each point of an n-dimensional manifold has a neighbourhood that is homeomorphic to the Euclidean space of dimension n. Lines and circles, but not figure eights, are one-dimensional manifolds. Two-dimensional manifolds are also called surfaces. Examples include the plane, the sphere, and the torus, which can all be embedded in three dimensional real space, but also the Klein bottle and real projective plane which cannot.Although a manifold resembles Euclidean space near each point, globally it may not. For example, the surface of the sphere is not a Euclidean space, but in a region it can be charted by means of map projections of the region into the Euclidean plane (in the context of manifolds they are called charts). When a region appears in two neighbouring charts, the two representations do not coincide exactly and a transformation is needed to pass from one to the other, called a transition map.The concept of a manifold is central to many parts of geometry and modern mathematical physics because it allows more complicated structures to be described and understood in terms of the relatively well-understood properties of Euclidean space. Manifolds naturally arise as solution sets of systems of equations and as graphs of functions. Manifolds may have additional features. One important class of manifolds is the class of differentiable manifolds.This differentiable structure allows calculus to be done on manifolds. A Riemannian metric on a manifold allows distances and angles to be measured. Symplectic manifolds serve as the phase spaces in the Hamiltonian formalism of classical mechanics, while four-dimensional Lorentzian manifolds model spacetime in general relativity.
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