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PL
The Polish translation of the most famous treatise of Newton has just been published, which is a good opportunity to recall some of the episodes related to the origin of Principia. In the first part of this three piece paper, the historical context is presented, in which unsolved scientific problems – specially those of planetary motions – were discussed before Newton; in the second part, the circumstances of the process of the writing of the Principia are outlined; in the third part, some facts are recalled which show that not all scientists and philosophers at once recognized the value and the importance of Newton’s treatise. Finally, some remarks on the Polish edition are made.
PL
Our present knowledge in the field of dynamical systems, information theory, probability theory and other similar domains indicates that the human brain is a complex dynamical system working in a strong chaotic regime in which random processes play important roles. In this environment our mental life develops. To choose a logically ordered sequence from a random or almost random stream of thoughts is a difficult and energy consuming task. The only domain in which we are able to do this with a full success is mathematics. Leibniz’s life ambition was to extend this success, with the help of what he called characteristica universalis, to other areas of human activity. The belief that this is possible lies at the basis of Leibniz’s rationalist system. Reasoning within his system, Leibniz claimed that also fundamental laws of physics can be deduced from the “first principles”. Just as linguistic or conceptual units are at the basis of the charactersistica universalis, his monads are responsible for physical activity of material bodies. When this rationalistic strategy is applied to the philosophy of space and time, it leads to their radically relational conception. Leibniz’s rationalistic approach to philosophy and science arouses out sympathy but it was Newton’s mathematical-empirical method that turned out to be effective in human endeavour to understand the functioning of the physical world. Successes of the Newtonian method  compel us to revise our concept of rationality.
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