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This volume presents a unified theory of shock waves corresponding to gravitational and electromagnetic fields and to magnetohydrodynamics in the context of general relativity. The common tool employed is provided by tensor distribution -- an approach which has been systematically developed by the author since 1962. One remarkable result is that this yields a complete theory of magnetohydrodynamic shock waves, which can also be applied to the treatment of pulsars. The same method is also applicable to the quantization of some physical fields in curved space-time. This, too, is discussed in...

This work was conceived as an introduction to global differ- ential geometry. It assumes known only the elements of classical differential geometry and Lie groupst. Some theorems are admit- ted without proof, but in the majority of cases detailed proofs are given. If this book allows researchers to initiate them- selves in contemporary works on the global theory of connections, it will have achieved its goal. The Consiglio Nazionale delle Ricerche has done me the great honour of including my book in its fine collection. I would wish it to find here an expression of my profound gratitude....

For seventy years, we have known that Einstein's theory is essentially a theory of propagation of waves for the gravitational field. Confusion enters, however, through the fact that the word wave, in physics, implies sometimes repetition and sometimes not. This confusion is often increased by he use of Fourier transforms, by which a disturbanse which appears to be without repetition is resolved into periodic wave-trains with all frequencies. But, in a general curved space-time, we have nothing corresponding to Fourier transforms. Here, we consider systematically waves corresponding to the...

Agresja Rosji na Ukrainę z 24 lutego 2022 roku zmieniła wszystko. Z jednej strony przyniosła krach imperialnych rojeń Moskwy, z drugiej - spowodowała solidarną reakcję państw zachodnich. To daje nadzieję na przyszłość, choć spokojnie już nie będzie.Wojna ostatecznie zakończyła belle poque w dziejach naszego regionu i pozbawiła liderów Zachodu złudzeń. Otworzyła też jednak przed Polską szansę na zajęcie bardziej poczesnego miejsca w Europie.Jak nie zmarnować tej szansy? Na jakie zmiany możemy się przygotować? Co czeka nasz kraj, w którym skończyły się dobre...