Organisms employ a multitude of strategies to cope with the dynamical environments in which they live. Homeostasis and physiological plasticity buffer changes within the lifetime of an organism,â€¦ (More)

The interior of every compact contractible PL n-manifold (n 5) supports a complete geodesic metric of strictly negative curvature. This provides a new family of simple examples illustrating theâ€¦ (More)

Let X be a compact subset of an orientable 4-manifold. The problem of determining conditions under which such a compactum has neighborhoods that are homeomorphic to S1 Ã— B3 is studied in this paper.â€¦ (More)

If X is a Hausdorff topological space then we let H(X) denote the group of autohomeomorphisms of X equipped with the compact-open topology. If A,B âŠ‚ X then we define [A,B] = {h âˆˆ H(X) : h(A) âŠ‚ B} andâ€¦ (More)