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1623074552

07 2021 ..

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Abstract: Penrose diagrams - what are they? The Penrose diagrams in the original version are a coordinate system that has no fundamental differences, for example, from the traditional Cartesian coordinate system. The conformal tangential compression used in the Penrose diagrams also has a fundamental similarity, for example, with logarithmic compression of the Cartesian coordinates. However, some modifications of the Penrose diagrams lead to the appearance of physically contradictory regions on them, for example, with anisotropy of time, ruptures of space, deformation of the coordinate grid.

. . . . XVIII . - 1917 .
1622807083

04 2021

: . . . . XVIII . - 1917 .

. . . : (XVI - XX .)
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04 2021

: . . . : (XVI - XX .)

Monographs and books prepared by the Tallinn Research Group
1622178538

28 2021 Kristofer

: Monographs, textbooks and books on the theory of cellular automata, computer mathematics systems, computer science, the general theory of statistics, prepared and published by the staff of the Tallinn Research Group in 19952019. Many of these publications are available for free viewing and downloading.

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1622037968

26 2021

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26 2021 .

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1621940395

25 2021

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1621849693

24 2021 ..

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Spacecraft engine on the effect of gravitational self-acceleration
It is believed that significant reserves of fuel are required to accelerate a spacecraft to high speeds, up to subluminal speeds. However, the limited speed of propagation of gravity leads to the emergence of the relativistic effect of gravitational self-acceleration, when an extended object increases the speed of its motion without the application of an external force to it, the so-called unsupported motion. Conversely, gravitational some acceleration becomes impossible if the speed of propagation of gravity is infinite.


1621765383

23 2021

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Cellular Automata: Brief historical survey
1621075964

15 2021 Kristofer

: Cellular Automata (CAs) parallel information processing systems that consists of infinity intercommunicating identical Mealy automata (elementary automata). We can interpret CAs as a theoretical basis of artificial high parallel information processing systems. From the logical standpoint a CA is an infinite automaton with specifical internal structure. The CA theory can be considered as structural and dynamical theory of the infinite automata. At that, CA models can serve as an excellent basis for modeling of many discrete processes, representing interesting enough independent objects for research too. Recently, the undoubted interest to the CA problems has arisen anew, and in this direction many remarkable results have been obtained. The CAaxiomatics provides three fundamental properties such as homogeneity, localness and parallelism of functioning. If in a similar computing model we shall with each elementary automaton associate a separate microprocessor then it is possible to unrestrictedly increase the sizesof similar computing system without any essential increase of its temporal and constructive expenses, required for each new expansion of the computing space, and also without any overheads connected to coordination of functioning of an arbitrary supplementary quantity of elementary microprocessors. In the work a brief historical survey of the cellular automata is presented.



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