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Hace 15 horas · Poland, officially the Republic of Poland, is a country in Central Europe.It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, and has a temperate transitional climate, while its longest river is the Vistula.Poland is the fifth-most populous member state of the European Union, with its sixteen voivodeships comprising a total population of over 38 ...
Hace 15 horas · The equations for relativistic quantum fields, of which the Klein–Gordon and Dirac equations are two examples, can be obtained in other ways, such as starting from a Lagrangian density and using the Euler–Lagrange equations for fields, or using the representation theory of the Lorentz group in which certain representations can be used to fix the equation for a free particle of given spin ...
