Glaz's existence problem for a non-Noetherian Cohen–Macaulay notion

The paper works with commutative rings and modules, and uses RGR^G for the subring of elements of a ring RR fixed by a group GG of automorphisms. A ring is coherent when its finitely generated ideals are finitely presented, and a coherent ring is regular when it has the corresponding regularity property.

Glaz's existence problem. Can one define non-Noetherian Cohen–Macaulay rings so that: (i) the definition agrees with the usual definition for Noetherian rings; (ii) coherent regular rings are Cohen–Macaulay; and (iii), whenever RR is a coherent regular ring, GG is a group of automorphisms of RR, there is an RGR^G-module retraction

ρ:RRG,\rho:R\longrightarrow R^G,

and RR is finitely generated as an RGR^G-module, the invariant ring RGR^G is Cohen–Macaulay?

This is Glaz's problem for extending Cohen–Macaulayness beyond the Noetherian setting while retaining the classical case, including coherent regular rings and a Hochster–Eagon-type invariant-ring theorem. The supplied text does not state whether the problem has been resolved.

Sources & referencesView supporting material

Primary source

Mohsen Asgharzadeh and Massoud Tousi, “On the notion of Cohen-Macaulayness for non Noetherian rings”, arXiv:0809.1228 (2008).

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