Published online by Cambridge University Press: 20 November 2018
Given a   $\text{TQFT}$  in dimension
 $\text{TQFT}$  in dimension   $d\,+\,1$ , and an infinite cyclic covering of a closed (
 $d\,+\,1$ , and an infinite cyclic covering of a closed (  $d\,+\,1$ )-dimensional manifold
 $d\,+\,1$ )-dimensional manifold   $M$ , we define an invariant taking values in a strong shift equivalence class of matrices. The notion of strong shift equivalence originated in R. Williams’ work in symbolic dynamics. The Turaev-Viro module associated to a
 $M$ , we define an invariant taking values in a strong shift equivalence class of matrices. The notion of strong shift equivalence originated in R. Williams’ work in symbolic dynamics. The Turaev-Viro module associated to a   $\text{TQFT}$  and an infinite cyclic covering is then given by the Jordan form of this matrix away from zero. This invariant is also defined if the boundary of
 $\text{TQFT}$  and an infinite cyclic covering is then given by the Jordan form of this matrix away from zero. This invariant is also defined if the boundary of   $M$  has an
 $M$  has an   ${{S}^{1}}$  factor and the infinite cyclic cover of the boundary is standard. We define a variant of a
 ${{S}^{1}}$  factor and the infinite cyclic cover of the boundary is standard. We define a variant of a   $\text{TQFT}$  associated to a finite group
 $\text{TQFT}$  associated to a finite group   $G$  which has been studied by Quinn. In this way, we recover a link invariant due to D. Silver and S. Williams. We also obtain a variation on the Silver-Williams invariant, by using the
 $G$  which has been studied by Quinn. In this way, we recover a link invariant due to D. Silver and S. Williams. We also obtain a variation on the Silver-Williams invariant, by using the   $\text{TQFT}$  associated to
 $\text{TQFT}$  associated to   $G$  in its unmodified form.
 $G$  in its unmodified form.