We use repeating sequences of expander graphs or small perturbations of expanders to present examples of ideals in the Roe algebras of bounded geometry discrete metric spaces which cannot be expressed as the sum of a ghost ideal and an ideal in which finite propagation operators are dense. This...
The change of direction of propagation of any wave, such as an electromagnetic wave, when it passes from one medium to another in which the wave velocity is different. Simply put, the bending of incident rays as they pass from one medium to another, such as air to water. Refractory A te...
The limit of the length is a function of several factors including capacitance (usual maximum limit is 400 pF), the minimum value for Rp, propagation delays along the cables, the type of cable used and the integrity of the logic signals in the presence of noise. There are bus rise and ...