The Spatial Search Problem: Structure and Complexity

The paper discusses structure and complexity of the spatial search problem. From a set of assumptions it derives a rather general version of the spatial search problem and investigates some of its fundamental properties. Most importantly, the paper shows that the decision problem corresponding to the spatial search problem in this general version is NP-complete.     

The astrolabe: Its uses and derivatives

Despite the technical means available for its diffusion, the information explosion is such that a diminishing proportion of geographical literature achieves the circulation that it deserves. The problem is illustrated by reference to a single country — Finland. In the case of such a country, even assuming familiarity with its languages, access to significant publication often proves impossible save on its home ground. Examples of three types of geographical literature are reviewed — 1) literature from the past which merits wider acquaintance because of its enduring value; 2) literature from the present which, on the score of methodology or theory independently of content, deserves attention, but which — not appearing in internationally familiar outlets — is unlikely to gain recognition; 3) similar literature directly relevant to the geography of Finland in the publications of cognate disciplines. The rate of change in the geographical scene and the volume of publication generated make it increasingly difficult for the would‐be specialist in even a relatively narrow field to keep up‐to‐date and to speed the circulation of information.     

Ausbildung

Ausbildung

Ausbildung     

Zur frühen Geschichte der Paläocheloniologie von Schaumburg‐Lippe. Die Rolle des Gymnasial‐Professors Max Ballerstedt in der Naturwissenschaft

A survey is given on some new aspects of the early history to the palaeochelonology in Schaumburg‐Lippe (Northern Germany). The very slow development of this is good reconstructable on base of authentic estates. It is the first time to made such a nearly complete reconstruction.