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Abstract
Let
( T , 𝔪 )
be a complete local (Noetherian) domain such that
depth T
> 1 . In addition, suppose
T contains the rationals,
| T |
=
| T ∕ 𝔪 | , and the set of all principal
height-1 prime ideals of
T has
the same cardinality as
T .
We construct a universally catenary local unique factorization domain
A such that the
completion of
A
is
T
and such that there exist uncountably many height-1 prime ideals
𝔮 of
A such that
( T ∕ ( 𝔮
∩
A ) T ) 𝔮 is a field. Furthermore, in
the case where
T is a normal
domain, we can make
A
“close” to excellent in the following sense: the formal fiber at every prime ideal
of
A of
height not equal to 1 is geometrically regular, and uncountably many height-1 prime
ideals of
A
have geometrically regular formal fibers.
Keywords
completions of local rings, excellent rings, unique
factorization domains
Mathematical Subject Classification 2010
Primary: 13F15, 13F40
Secondary: 13B35, 13J10
Milestones
Received: 2 September 2019
Revised: 10 December 2019
Accepted: 10 December 2019
Published: 4 February 2020
Communicated by Scott T. Chapman