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For the concept of spectrum of a ring in algebraic geometry, see spectrum of a ring.
- μ:E ∧ E → E
and a unit map
- η:S → E,
where S is the sphere spectrum. These maps have to satisfy associativity and unitality conditions up to homotopy much in the same way as the multiplication of a ring is associative and unital. That is,
- μ (id ∧ μ) ∼ μ (μ ∧ id)
- μ (id ∧ η) ∼ id ∼ μ(η ∧ id).
- Adams, J. Frank (1974), Stable homotopy and generalised homology, Chicago Lectures in Mathematics, University of Chicago Press, ISBN 0-226-00523-2, MR 402720
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