ekosmider

A quiet homemaker, occasionally forced to wrestle without any rules. An avid vegetarian, for which he paid the ultimate price. An object of worship whose smell could be smelled from miles away. We talk about the Pleistocene cave bear inhabiting the Bear Cave in Kletno – because it is the bear in question – with dr hab. Adrian Marciszak, prof. UWr.

How did Polish inventors contribute to Allied success during World War II? Was Polish poetry of interest to American workers of Polish descent and why did „impossible names” hinder the integration of Poles in the United States? – About this and many other interesting questions concerning the Polish American community, we talk with prof. dr. hab. Joanna Wojdon, author of Polish American History after 1939, published by Routledge.

Space-time symmetries are a key component of fundamental physical theories, such as classical and quantum electrodynamics, or general relativity theory (classical gravitational field theory). The most fundamental of these are described by the Lorentz group (for a non-zero cosmological constant this generalises to the de Sitter or anti-de Sitter group), preserving the value of the speed of light c. On the other hand, if we consider the so-called Galilean limit, in which c goes to infinity, we reduce the theory in question to classical Newtonian physics, where time is absolute.