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Convex hull (red) of a polygon (yellow). The usual set closure from topology is a closure operator. Other examples include the linear span of a subset of a vector space, the convex hull or affine hull of a subset of a vector space or the lower semicontinuous hull ¯ of a function : {}, where is e.g. a normed space, defined implicitly (¯) = ¯, where is the epigraph of a function .
In mathematics, specifically set theory, the continuum hypothesis (abbreviated CH) is a hypothesis about the possible sizes of infinite sets. It states: It states: There is no set whose cardinality is strictly between that of the integers and the real numbers .
MyMaths is a subscription-based mathematics website which can be used on interactive whiteboards or by students and teachers at home. [1] [2] It is owned and operated by Oxford University Press, who acquired the site in 2011. As of February 2021, MyMaths has over 4 million student users in over 70 countries worldwide. [3]
The Polymath Project is a collaboration among mathematicians to solve important and difficult mathematical problems by coordinating many mathematicians to communicate with each other on finding the best route to the solution.
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