In mathematics, a highly structured ring spectrum or ∞-ring is an object in homotopy theory encoding a refinement of a multiplicative structure on a cohomology theory. A commutative version of an ∞-ring is called an E-∞ ring. While originally motivated by questions of geometric topology and bundle theory, they are today most often used in stable homotopy theory.

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See also *ring object*.

Last revised on August 21, 2015 at 07:05:41. See the history of this page for a list of all contributions to it.