Catenary ring

Catenary ring

In mathematics, a commutative ring "R" is catenary if for any pair of prime ideals

:"p", "q", any two strictly increasing chains

:"p"="p"0 ⊂"p"1 ... ⊂"p""n"= "q" of prime ideals

are contained in maximal strictly increasing chains from "p" to "q" of the same (finite) length. In other words, there is a well-defined function from pairs of prime ideals to natural numbers, attaching to "p" and "q" the length of any such maximal chain. In a geometric situation, in which the dimension of an algebraic variety attached to a prime ideal will decrease as the prime ideal becomes bigger, there is reason to believe that the length of such a chain will conform to "n" = difference in dimensions, with dimension decrementing by 1 at each step.

A ring is called universally catenary if all finitely generated rings over it are catenary.

The word 'catenary' is derived from the Latin word "catena", which means "chain".

Examples

Almost all Noetherian rings that appear in algebraic geometry are universally catenary.In particular the following rings are universally catenary:
*Complete Noetherian local rings
*Dedekind domains (and fields)
*Cohen-Macaulay rings
*Any localization of a universally catenary ring
*Any finitely generated algebra over a universally catenary ring.

It is very hard to construct examples of rings that are not universally catenary. The first example was found by Masayoshi Nagata in 1956 (see Nagata (1962) page 203 example 2), who produced a Noetherian local domain that was catenary but not universally catenary.

References

*H. Matsumura, "Commutative algebra" ISBN 0-8053-7026-9.
*Nagata, Masayoshi "Local rings." Interscience Tracts in Pure and Applied Mathematics, No. 13 Interscience Publishers a division of John Wiley & Sons,New York-London 1962, reprinted by R. E. Krieger Pub. Co (1975) ISBN 0882752286


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Height (ring theory) — In commutative algebra, the height of an prime ideal mathfrak{p} in a ring R is the number of strict inclusions in the longest chain of prime ideals contained in mathfrak{p} [Matsumura,Hideyuki: Commutative Ring Theory ,page 30 31,1989 ] . Then… …   Wikipedia

  • Excellent ring — In mathematics, in the fields of commutative algebra and algebraic geometry, an excellent ring is a Noetherian commutative ring with many of the good properties of complete local rings. This class of rings was defined by Alexander Grothendieck… …   Wikipedia

  • List of mathematics articles (C) — NOTOC C C closed subgroup C minimal theory C normal subgroup C number C semiring C space C symmetry C* algebra C0 semigroup CA group Cabal (set theory) Cabibbo Kobayashi Maskawa matrix Cabinet projection Cable knot Cabri Geometry Cabtaxi number… …   Wikipedia

  • Serial module — Chain ring redirects here. For the bicycle part, see Chainring. In abstract algebra, a uniserial module M is a module over a ring R, whose submodules are totally ordered by inclusion. This means simply that for any two submodules N1 and N2 of M,… …   Wikipedia

  • building construction — Techniques and industry involved in the assembly and erection of structures. Early humans built primarily for shelter, using simple methods. Building materials came from the land, and fabrication was dictated by the limits of the materials and… …   Universalium

  • New Haven Line —      New Haven Line New Haven bound M8s pass through Port Chester, NY Overview …   Wikipedia

  • Glossary of scheme theory — This is a glossary of scheme theory. For an introduction to the theory of schemes in algebraic geometry, see affine scheme, projective space, sheaf and scheme. The concern here is to list the fundamental technical definitions and properties of… …   Wikipedia

  • China railways CIT trains — refers to high speed test trains that are used on the Chinese High Speed railways, CIT means Comprehensive Inspection Train. usually ordered by Chinese Ministry of Rail (MOR) or China Academy of Railway Sciences (CARS). The trains equipped with… …   Wikipedia

  • Overhead power line — This article is about power lines for general transmission of electrical power. For overhead lines used to power road and rail vehicles, see Overhead lines. Transmission lines in Lund, Sweden …   Wikipedia

  • Delhi Metro — दिल्ली मेट्रो Info Locale NCR, India (Delhi, Gurgaon, Noida) …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”