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<p>(a precursor to a sheaf that is only defined on the open subsets of a topological <a href="page.php?w=Base_%28topology%29">basis</a> ) and, therefore, that it defines a <a href="page.php?w=sheaf_%28mathematics%29">sheaf</a> by unique extension of this -sheaf. In more detail, the distinguished open subsets are a <a href="page.php?w=base_%28topology%29">basis</a> of the Zariski topology, so for an arbitrary open set  written as the union of  we set  where  denotes the <a href="page.php?w=inverse_limit">inverse limit</a> with respect to the natural</p><p>
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