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EN
The advancement of humanity has culminated in artificial intelligence and it cannot do without the measurement of time and the existence of different calendars, such as the one used today, which has notable religious influences. Starting from a reflection on the relationship among artificial intelligence, the fundamental right of religious freedom, and the various types of calendars, the study focuses on highlighting the religious influences which are inside the calendar used throughout the world, their months and days. This calendar is based on the Roman calendar, which was reformed by Julius Caesar, and corrected centuries later, by the reform carried out by Pope Gregory XIII. This is followed by a brief exposition of a purely religious calendar such as the Muslim one, as well as the frustrated attempts to establish secular calendars during the French and Russian revolutions, in the 18th and 20th centuries, respectively
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EN
In the present study attention is paid to the question if some especially interesting periods can be found from the point of view of profitability at the Polish stock market. Days of the week, particular weeks of the month and the month of the year were taken into consideration. The following tests were applied: agreement test ÷2, Binomial Test and Anova analysis. The author was interested in the sign of the change of stock prices. The WIG (Warsaw Stock Exchange Index) was chosen as the representative of the changes and its successive falls and rises were noted. Ultimately it was found that in observations of the successive weeks of the month there were no statistically significant differences; on the other hand in observations of particular days of the week and months of the year there were some regularities that were proofs of some differences in profitability of particular periods of observation.
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