**Publication status:** appeared
in Compositio Math. **99**
(1995).

**Abstract:**

A Beilinson Completion Algebra (BCA) is a generalization of a complete
semi-local ring. A BCA A over a perfect field k is a finite product of
local BCAs. Algebraically, a local BCA is a complete local k-algebra
whose
residue field is a high dimensional local field. In addition A has a
topology,
and we require that there is a surjection F((s_{1}, ...,
s_{n}))[[t_{1},
..., t_{m}]] --> A respecting all this structure, with F a finitely
generated
extension of k.

This is an abstraction of the algebras one gets by applying Beilinson completion to the sheaf \cal{O}_{X} along a chain of points in X, when X is a finite type scheme over k.

There are two kinds of important maps between BCAs, called morphisms and intensifications. These again are extracted from geometric situations.

The main result is the existence of a dual module \cal{K}(A). This is an injective module, with topology, which varies functorially with morphisms and intensifications.

The theory of BCAs is the basic
tool for the explicit construction of
the residue complex in Residues
and
differential operators on schemes.

**Electronic Preprint:** postscript
file (369K)

journal pdf file

(updated 26.11.07)