Many polyvariant program analyses have been studied in the 1990s, including k-CFA, polymorphic splitting, and the cartesian product algorithm. The idea of polyvariance is to analyze
functions more than once and thereby obtain better precision for each call site. In this paper
we present an equivalence theorem which relates a co-inductively-defined family of polyvariant flow analyses and a standard type system. The proof embodies a way of understanding
polyvariant flow information in terms of union and intersection types, and, conversely, a way
of understanding union and intersection types in terms of polyvariant flow information. We
use the theorem as basis for a new flow-type system in the spirit of the λCIL-calculus of Wells,
Dimock, Muller and Turbak, in which types are annotated with flow information. A flow-type
system is useful as an interface between a flow-analysis algorithm and a program optimizer.
Derived systematically via our equivalence theorem, our flow-type system should be a good
interface to the family of polyvariant analyses that we study.