In this chapter we introduce differentiable manifolds and smooth maps. A differentiable manifold' is a topological space on which there are defined coordinates allowing basic notions of differentiability.

Stygobionts overwhelmingly comprise crustaceans belonging to many higher taxa, including those with broad ecological and geographical distributions (such as Copepoda, Ostracoda, Amphipoda, Isopoda, and Decapoda).

We polish our uncoated metal disks to a mirror finish for optimum headflight characteristics and virtually no possibility of media-induced headcrash.

1. Powell and Pressburger produced a short film between Colonel Blimp and A Canterbury Tale: The Volunteer, a recruiting film for the Fleet Air Arm, for which they had total Admiralty cooperation, which suggests they were far from personas non grata with the authorities.