What sort of grid cells do we expect to see in rodents who have spent their developmental period inside a large spherical cage? Or, in a different experimental paradigm, toddling on a revolving ball, with virtual reality simulating a coherently revolving surround? We consider a simple model of grid firing map formation, based on firing rate adaptation, that we have earlier analyzed when playing...

The Air Force Working Capital Fund (AFWCF), a revolving fund established to create a more business-like environment between the Air Force and its customers, is comprised of several divisions providing depot level repairs, supplies and inventory, information technology solutions and transportation services to military customers. Since its establishment, the AFWCF has been the source of much crit...

We give a new, elementary, purely analytical development of Descartes’ theorem that a smooth connected surface is a perfect focusing lens if and only if it is a connected subset of the ovoid obtained by revolving a cartesian oval around its axis of symmetry.