expressed her desire for “a building or adequate space in one for educational programs and loaned exhibits.” The new Pizzagalli Center for Art and Education, which will hold exhibitions, lectures, films, concerts, and workshops, even during the challenging months of Vermont weather, is the...
Ramos et al. [17] analyzed lightning activity over mainland Portugal during the period 2003–2009 and found three main weather patterns: frontal activity, cut-off lows and summer thermal lows. The frontal activity is mostly relevant in the winter season, as storms are formed in the Atlantic Oc...
Then, in Section 3, a basic presentation is given of the types of invariant tensors called “projective tensors” in relation to the group of homographies. There are big differences between some classes of these tensors and those of the (pseudo-)Euclidean geometries. The major difference being...
The first question we naturally address is to determine the types of possible metrics resulting from the transition between homogeneous and inhomogeneous coordinates. We give a result for a particular class of conformal metrics initially associated with the canonical metric defining hyperbolic space. This...