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Let (X, τ) be a topological space, a base B is a
Let (X, τ) be a topological space, a base B is a

EE38 SKG2
EE38 SKG2

... B. Fora type results : Fora’s improvements of Nadler’s results are based on the observation that in Nadler’s results , metric character of Z is not necessary, uniform continuity of f is too strong and contraction condition is sufficient even if it is available locally. Therefore Fora replaced X by a ...
Course 421: Algebraic Topology Section 1
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... Definition Let X1 , X2 , . . . , Xn be topological spaces. A subset U of the Cartesian product X1 × X2 × · · · × Xn is said to be open (with respect to the product topology) if, given any point p of U , there exist open sets Vi in Xi for i = 1, 2, . . . , n such that {p} ⊂ V1 × V2 × · · · × Vn ⊂ U . ...
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... Note that each transition function is really just n real-valued functions of n real variables, and so we can ask whether these are continuously differentiable. The atlas A defines a differential structure on M , if every transition function is continuously differentiable. ∗ hManifoldi created: h2013 ...
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Measures - UC Davis Mathematics

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The way-below relation of function spaces over semantic domains

... modelled too closely on the Hausdorff case. Nevertheless, for many results we need additional conditions on X that will not be surprising for the experts. We shall ask the space X to be locally compact and coherent. The last condition needs some explanation. In any topological space X we may conside ...
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Grothendieck topology

In category theory, a branch of mathematics, a Grothendieck topology is a structure on a category C which makes the objects of C act like the open sets of a topological space. A category together with a choice of Grothendieck topology is called a site.Grothendieck topologies axiomatize the notion of an open cover. Using the notion of covering provided by a Grothendieck topology, it becomes possible to define sheaves on a category and their cohomology. This was first done in algebraic geometry and algebraic number theory by Alexander Grothendieck to define the étale cohomology of a scheme. It has been used to define other cohomology theories since then, such as l-adic cohomology, flat cohomology, and crystalline cohomology. While Grothendieck topologies are most often used to define cohomology theories, they have found other applications as well, such as to John Tate's theory of rigid analytic geometry.There is a natural way to associate a site to an ordinary topological space, and Grothendieck's theory is loosely regarded as a generalization of classical topology. Under meager point-set hypotheses, namely sobriety, this is completely accurate—it is possible to recover a sober space from its associated site. However simple examples such as the indiscrete topological space show that not all topological spaces can be expressed using Grothendieck topologies. Conversely, there are Grothendieck topologies which do not come from topological spaces.
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