Algebraic topology Stable homotopy theory and generalized cohomology Theorem
Ravenel conjectures
Builds on Chromatic homotopy theorySpectrumNilpotence theoremPrime number
Statement
Fix a prime number . Let be the -th Morava K-theory, with . Let be Bousfield localization with respect to the Johnson–Wilson spectrum , as in chromatic homotopy theory. A finite -local spectrum has type if and for all . The following conjectures of Ravenel are theorems.
- (Nilpotence) A self-map of a finite -local spectrum is nilpotent if is nilpotent for every . This is a form of the nilpotence theorem.
- (Periodicity) If has type , there is a map such that is an isomorphism and is nilpotent for .
- (Thick subcategories) Let be the category of finite -local spectra of type at least . Every thick subcategory of is either some or the zero subcategory.
- (Smash product) For every spectrum , the natural map is an equivalence, where is the -local sphere spectrum.
- (Chromatic convergence) For every finite -local spectrum , the map is an equivalence.
Remarks
Ravenel posed these conjectures in 1984, together with the telescope conjecture. Devinatz, Hopkins and Smith proved the nilpotence theorem, and Hopkins and Smith deduced the periodicity and thick subcategory theorems from it. Hopkins and Ravenel proved the smash product and chromatic convergence theorems. The telescope conjecture is the exception: it holds at heights and but fails at every height .
At work: the sphere has type , and the mod Moore spectrum has type . For odd, the periodicity theorem is realised by Adams' map , whose iterates give infinite families in the stable homotopy groups of spheres.
Going deeper
For a student
The thick subcategory theorem lets one prove a property for all finite spectra of type at least by checking it on a single example. The periodicity theorem produces the -periodic families in the homotopy of spheres that chromatic homotopy theory studies. The smash product theorem says that is a smashing localization, so it is determined by . Chromatic convergence says that nothing is lost by studying a finite spectrum layer by layer.
Reading path
To understand this page from the ground up, read these 9 pages in order. The foundations come first.
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- no evidence level
- Chromatic homotopy theory concept
- Complex cobordism concept
- Prime number concept
- Ring spectrum concept
- Spectrum concept
- Stable homotopy groups of spheres concept
- Nishida nilpotence theorem statement
- Nilpotence theorem statement
- Ravenel conjectures statement
Where this leads
1 page builds on this one.
Further reading
About this page
| Tag | B8XP2K7RS1 |
|---|---|
| URI | m2://B8XP2K7RS1 |
| Kind | statement, theorem |
| Writing | W0 stub |
| MSC | 55P42, 55Q51, 55P60 |
| Status | This copy of the site has no build data. Run m2 status B8XP2K7RS1. |
| About | Chromatic homotopy theory |
| Uses | Chromatic homotopy theory, Spectrum, Nilpotence theorem, Prime number |
| Same as | |
| Changed | 2 November 2026 |
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