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ring spectra
ring spectra
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perfect complexes
- orthogonal spectra
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cohomolology theory
We say that a cohomology theory \(E\) is multiplicative if its representing spectrum is endowed with a multiplication \(E^{\wedge 2}\to E\) that is associative and unital up to homotopy, i.e. a ring spectrum.
- cobordism
- Morava E theory