Indian scientist Amal Kumar Raychaudhuri established ‘Raychaudhuri equation’ in 1955 to describe gravitational focusing properties in cosmology. This equation is extensively used in general relativity, quantum field theory, string theory and the theory of relativistic membranes. This paper...

An exact solution of Einstein equation is easier than actual solution. The Schwarzschild metric is established on the basis of Einstein’s exact solution and it is also a static and stationary solution. The Schwarzschild solution expresses the geometry of a spherically symmetric massive...

The SME sector is one of the factors that contribute to economic growth in every country on the national and regional level, and it holds true to Poland and Slovakia. Although this sector grew most rapidly during the beginning transition period, it still retains its significant role in the...

The aim of the study is to describe the general upper limit of the age of the universe with the help of different cosmological models of the universe. Here homogeneous and isotropic assumptions of the observed universe are not strictly followed to calculate the present age of the universe....

The Friedmann, Robertson-Walker universe is based on the assumption that the universe is exactly homogeneous and isotropic. This model expresses that there is an all encompassing big bang singularity in the past as the origin from which the universe emerges in a very hot phase and continues its...

The main attention of the submitted paper is devoted to the comparison of development of entrepreneurship in Slovak and Polish small and medium – sized enterprise sector. The conditions for blooming entrepreneurship are created in a national economy. Especially the role of SMEs in transition...

The main focus of the article is to elaborate on the importance and role of small and medium-sized enterprises in Slovak economy. The authors show development tendencies of SME sector in Slovakia in the years 1993-2006. Where it was possible the authors enumerated the data for the year 2007. The...