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<p>of the category of commutative rings under R.)  The <a href="page.php?w=prime_spectrum">prime spectrum</a> functor Spec then determines an <a href="page.php?w=dual_%28category_theory%29">anti-equivalence</a> of this category to the category of <a href="page.php?w=affine_scheme">affine scheme</a>s over Spec R.</p>

<p>How to weaken the commutativity assumption is a subject matter of <a href="page.php?w=noncommutative_algebraic_geometry">noncommutative algebraic geometry</a> and, more recently, of <a href="page.php?w=derived_algebraic_geometry">derived algebraic geometry</a>.</p><p>
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