Historically, Ehrenfest’s theorem is the first one which shows that classical physics can emerge from quantum physics as a kind of approximation. We recall the theorem in its original form, and we highlight its generalizations to the relativistic Dirac particle and to a particle with spin and izospin. We argue that apparent classicality of the macroscopic world can probably be explained within the framework of standard quantum mechanics.

Our article is an overview of a selection of findings in physics relating to the issue of time—we do not present in it any “time theory” of our own. After making some general remarks on the issue of time, we present historical outline and a brief description of the current state of time interval measurements. Subsequently, we go on to discuss certain (relating to the concept of time) consequences of both theories of relativity: special and general. Here, time is a (...) geometrical component of space-time continuum. Following section is dedicated to time in the so-called Hamiltonian formulations of the theory of particles, where it appears as a parameter of evolution. The last section contains remarks referring to certain attempts of going beyond the recognized physical theories relating to the question of time. (shrink)

Our article is an overview of a selection of findings in physics relating to the issue of time—we do not present in it any “time theory” of our own. After making some general remarks on the issue of time, we present historical outline and a brief description of the current state of time interval measurements. Subsequently, we go on to discuss certain (relating to the concept of time) consequences of both theories of relativity: special and general. Here, time is a (...) geometrical component of space-time continuum. Following section is dedicated to time in the so-called Hamiltonian formulations of the theory of particles, where it appears as a parameter of evolution. The last section contains remarks referring to certain attempts of going beyond the recognized physical theories relating to the question of time. (shrink)

This article deals with basic changes in Polish society over past 20 years. On the basis of sociological surveys, the author attempts to answer the following questions: to what extent has systemic change brought about significant changes in social stratification? In which dimensions did it take place? What are the consequences of these changes for individuals and the social system? How does Polish society differ from others? As for social stratification, the only clear and unambiguous tendencies were growing inequality and (...) more marked effects of educational credentials on incomes. Contrary to expectations, barriers to mobility have not become more rigid, nor is there any clear evidence of social origins mattering more for educational achievement. Transformations in social structure have been accompanied by rising discontent with material conditions, the government, and the system as a whole. Interestingly, this wave runs counter to positive evaluations in the private sphere, displayed in relatively high self-esteem and satisfaction with friendships and family life. These optimistic attitudes contrasted with disapproval of the political class, and with the workings of democracy. The degree of legitimization of the political system in Poland appears to be the lowest among 21 European societies. When compared with the capitalist West, this constitutes one of the obstacles to modernization along Western lines. (shrink)

Decisions concerning price development are best visible in view of their direct impact on the market activities of the company and the general level of profitability. In every activity, the success is measured by an excess of sales revenue over the costs of used resources. In an ideal case, a determined price provides the highest margin resulting from an analysis of the sales volume, takes into consideration the customer's evaluation of the product/service, and allows to react to competitive threats and (...) to fend off the competition's attacks. There is no single universal way to develop prices for various enterprise types, regardless of the conditions of demand, the specific character of the sector they operate in, or the competitive situation, even if we assume that the enterprise has only one goal of activity. That's why, Author recommends three price determination methods. The ways of price determination presented in this article are just the first step on the way to reach the optimal prices. The prices determined in such way, as well as product or service prices already functioning in the market, are subject to modification depending on the assumed goals, taking into consideration the character of demand for a given commodity and the behaviour of the competition. (shrink)

We start from the assumption that the main problem, and at the same time the goal, is socio-economic development. We also assume that this pursuit is universal, development is the ambition of entities at all levels of aggregation, development is a desire of each country, as well as of business entities and individuals. From the other side, the governments create conditions for entities at the microeconomic level which generate additional value, that is, contribute to the creation of this development. Peculiar (...) to them they are developmental paths. That’s why, the main hypothesis of this article, as stating that the choice of economic policy financed by excessive public debt does not, in the long run, serve well real socio-economic development. At the beginning of the 21st century, the vast majority of these countries had serious problems with public debt. These problems already had their history and were so serious that some efforts to discipline the forum of this group appeared. It is, in a sense, natural in the sense that integration itself is heading to a high degree of coordination and to the unification of all economic policies. The picture of public finances of the European Union does not look good despite the fact that this group can boast a long history of making efforts to control and monitor the budgets of its member states. Moreover, one can even talk about a certain intensification of this process, especially with respect to the euro area countries, but we still can not say that satisfactory results have been achieved. (shrink)

Crises come and go, but it is good if, from the perspective of the past, we can point to some positives of the crisis that has just passed. Indeed, in the article we first find a snapshot of the export activity of the Polish economy in recent years, a picture which is positive, despite the very serious crises in the global economy. This picture may not be complete due to the scope of the study, but it shows what is most (...) important in author opinion – our place in the international division of labor over the last 15 years. This place has steadily improved, with particularly spectacular increases in importance observed during the years of the Covid-19 pandemic crisis and after the outbreak of war in Ukraine. The second section of the article presents an analysis of agri-food exports in a broader time frame, dating back to the 2000s. It aims to highlight the rise of agri-food exports as a proportion of GDP and total exports. Equally fascinating is the geographical and commodity structure and the mportance of Polish agri-food imports in the total of those made by selected countries. As a result, an interesting picture of Polish agri-food exports appears to have emerged, allowing positive assessments to be formulated. Quite optimistic prognoses for the future are also noticeable. (shrink)

The volume collects classics of Marxist historiography of science, including a new translation of Boris Hessen's “The Social and Economic Roots of Newton's ...

Rhymed text and movable pictures present a variety of amusing situations.

Celem artykułu jest analiza mobilności Antonia Santa Crocego – tytularnego arcybiskupa Seleucji i nuncjusza apostolskiego w Rzeczypospolitej Obojga Narodów w latach 1627–1630. Autorzy odtworzyli podróż dyplomaty papieskiego z Rzymu do Rzeczypospolitej odbytą w 1627 r., podróż powrotną nad Tyber z 1630 r. oraz dwa wojaże po Polsce – miesięczny wyjazd do Prus z 1627 r., podjęty w związku z trwającą wojną o ujście Wisły oraz polsko-szwedzkimi rokowaniami prowadzonymi przy udziale mediatorów niderlandzkich, a także – dwumiesięczny objazd Mazowsza, będący w rzeczywistości (...) ucieczką przed zarazą, jaka w drugiej połowie 1629 r. nawiedziła ziemie Korony. Podstawą opracowania jest korespondencja Santa Crocego z Sekretariatem Stanu Stolicy Apostolskiej, nad którym pieczę sprawował kardynał nepot Francesco Barberini. Wspomniana korespondencja przechowywana jest w Archivio Apostolico Vaticano oraz w Biblioteca Apostolica Vaticana. Znaczna jej część została wydana w serii Acta Nuntiaturae Polonae (t. XXIII, vol. 1–2). Interesującym źródłem o charakterze uzupełniającym jest _Diario di Roma (1608–1644) _autorstwa Giacinto Gigliego, w którym pamiętnikarz uwiecznił wjazd Santa Crocego do Wiecznego Miasta latem 1630 r. Ponadto autorzy wykorzystali literaturę przedmiotu poświęconą zagadnieniu podróży przedstawicieli papieskich, m.in. prace ks. Henryka Damiana Wojtyski, Teresy Chynczewskiej-Hennel czy Tadeusza Fitycha. Autorzy dokonali analizy rękopiśmiennych materiałów źródłowych pod kątem mobilności nuncjusza Santa Crocego, dzięki czemu udało się uzupełnić jego itinerarium. W publikacji zwrócono uwagę na opisy odwiedzanych przez niego miejsc oraz personalia osób, z którymi przedstawiciel papieski spotykał się podczas swych wojaży. Zarysowano również pewne wątki, które będą kontynuowane w przyszłych badaniach, a dotyczą sfery organizacyjnej nuncjatury w czasie, gdy przedstawiciel papieski przebywał poza dworem. Artykuł może stanowić cenne uzupełnienie do badań nad podróżami w czasach nowożytnych, jak również przyczynek do zagadnienia związanego z mobilnością dyplomatów w czasie realizowania ich misji. (shrink)

The article deals with the perception of the Pope John Paul II and Poland in the two speeches of the Presidents of the United States of America. The George W. Bush’s speech given on the occasion of the dedication of the Pope John Paul II Cultural Center in Washington DC on March 22, 2001 and the Donald Trump’s speech delivered in front of the Warsaw Uprising Monument on the Krasinski Square in Warsaw on July 8, 2017 were used as the (...) sources for the study. The former speech is a laudation in honor of the Pope from Poland, whose biography was considered by the 43rd President of the United States as one of the most interesting in human history. Among the most notable episodes of the pontificate, George W. Bush listed the 1979 pilgrimage to his homeland, the 1995 visit to Manila in Philippines, the unprecedented visits to a synagogue and a Muslim country, the forgiveness shown to Ali Ağca – the would-be assassin, and the visits to the United States during which the Pope from Poland reminded the people of human dignity and the virtues of a just society. The latter speech is a laudation on the spirit of the Polish nation. Donald Trump emphasized the steadfastness of the Poles in the struggle to preserve their cultural identity despite the loss of their homeland. He recalled the period of partition and extermination of the Polish nation by the German Nazis and the Soviet Communists during World War II. The 45th President of the United States reminded the world about famous Poles: Nicolaus Copernicus, Frederic Chopin, Casimir Pulaski, Thaddeus Kosciuszko and Saint John Paul II. He also spoke about the lasting ties between the Americans and the Poles and about the common values cherished on both sides of the Atlantic. On the example of social transformations in Poland and Europe initiated by John Paul II’s pilgrimage to Poland in 1979, Donald Trump emphasized the influence of faith in God on political and social transformations in the world. He also expressed hope for the survival of Western civilization based on faith in God and the preservation of family and freedom. (shrink)

We take I.Q. tests but not Compassion Aptitude tests. Yet mind and emotions need to be seen as two different parts of the same spectrum if the battered human psyche is to be mended. Skolimowski sees the opportunity for a new order to be brought about if the Western mind can return to, then reintegrate, the spiritual.

The 'Discussion' section of this issue contains the following responses to Wilfred Beckerman's article 'Sustainable Development: Is it a Useful Concept?' Environmental Values 3,3 (1994): 191-209. Herman Daly, 'On Wilfred Beckerman's Critique of Sustainable Development'; Michael Jacobs, 'Sustainable Development, Capital Substitution and Humility: A Response to Beckerman'; and Henryk Skolimowski, 'In Defence of Sustainable Development'. These criticisms are answered by Beckerman in Environmental Values 4,2.