3 papers
math.LO2016
Model theory and geometry of representations of rings of integers
Boris Zilber, Lubna Shaheen
The aim of this project is to attach a geometric structure to the ring of integers. It is generally assumed that the spectrum defined by Grothendieck se…
math.RA2010
Some more axiomatisability for S-acts
Lubna Shaheen
This paper discusses necessary and sufficient conditions on a monoid S, such that the class of C-flat left -acts is axiomatisable, where C is the class of all embeddings (of rig…
math.RA2009
Axiomatisability problems for S-posets
Victoria Gould, Lubna Shaheen
Let C be a class of algebras of a given fixed type t. Associated with the type is a first order language L_t. One can then ask the question, when is the class C axiomatisable by se…