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Wyszukujesz frazę "Heller, Michael" wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Syntax-Semantics Interaction in Mathematics
Autorzy:
Heller, Michael
Powiązania:
https://bibliotekanauki.pl/articles/561342.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Semiotyczne
Tematy:
philosophy of mathematics
categorical logic
syntax-semantic interaction
Bell’s program
Gödel-like limitations
Opis:
Mathematical tools of category theory are employed to study the syntaxsemantics problem in the philosophy of mathematics. Every category has its internal logic, and if this logic is sufficiently rich, a given category provides semantics for a certain formal theory and, vice versa, for each (suitably defined) formal theory one can construct a category, providing a semantics for it. There exists a pair of adjoint functors, Lang and Syn, between a category (belonging to a certain class of categories) and a category of theories. These functors describe, in a formal way, mutual dependencies between the syntactical structure of a formal theory and the internal logic of its semantics. Bell’s program to regard the world of topoi as the univers de discours of mathematics and as a tool of its local interpretation, is extended to a collection of categories and all functors between them, called “categorical field”. This informal idea serves to study the interaction between syntax and semantics of mathematical theories, in an analogy to functors Lang and Syn. With the help of these concepts, the role of Gödel-like limitations in the categorical field is briefly discussed. Some suggestions are made concerning the syntax-semantics interaction as far as physical theories are concerned.
Źródło:
Studia Semiotyczne; 2018, 32, 2; 87-105
0137-6608
Pojawia się w:
Studia Semiotyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The closed Friedman world model with the initial and final singularities as a non-commutative space
Autorzy:
Heller, Michael
Sasin, Wiesław
Powiązania:
https://bibliotekanauki.pl/articles/1342663.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
singularities
Friedman cosmology
non-commutative geometry
Opis:
The most elegant definition of singularities in general relativity as b-boundary points, when applied to the closed Friedman world model, leads to the disastrous situation: both the initial and final singularities form the single point of the b-boundary which is not Hausdorff separated from the rest of space-time. We apply Alain Connes' method of non-commutative geometry, defined in terms of a C*-algebra, to this case. It turns out that both the initial and final singularities can be analysed as representations of the C*-algebra in a Hilbert space. The method does not distinguish points in space-time, but identifies space slices of the closed Friedman model as states of the corresponding C*-algebra.
Źródło:
Banach Center Publications; 1997, 41, 1; 153-161
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anaerobic performance in 30s Wingate test as one of the possible criteria for selection Czech hockey players into National Hockey League
Autorzy:
Heller, Jan
Vodicka, Pavel
Janek, Michael
Powiązania:
https://bibliotekanauki.pl/articles/1921992.pdf
Data publikacji:
2019-03-20
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
anaerobic capacity
anaerobic power
National Hockey League
professional ice hockey players
Wingate test
Opis:
The selection into the National Hockey League (NHL) is based on criteria reflecting job analysis of a professional ice hockey player and the requirements of the game. Only few Czech elite ice hockey players succeed to participate in NHL and their number is decreasing in the last decade. Aim of Study: The aim of the study was to find out and evaluate the level of anaerobic readiness of Czech hockey forwards and defenders playing in the NHL and to compare their anaerobic performance with that in elite national hockey players from the Czech extra-league. Material and Methods: Results of 30s Wingate anaerobic test obtained in 26 forwards and 16 defenders, Czech hockey players from the NHL (from 2001/2002 to 2015/2016 seasons) were compared with the reference values of elite Czech ice hockey players. The comparison was based on the mean values, rate of dispersion, and effect sizes were calculated using Cohen's d coefficient. Results: In forwards, both absolute and relative values of peak power (PP) and anaerobic capacity (AnC) found in Czech players in NHL were higher (d>1) than in elite Czech national players. In defenders, only the value of AnC relative to body mass showed small effect (d=0.36), but absolute and relative values of PP and absolute value of AnC were higher (d>1) than in elite Czech national players. Conclusion: The results of the study indicate that anaerobic readiness evaluated by 30s Wingate test may be, besides dominant on-ice skills, one of the criteria for entry to the top ice hockey competition.
Źródło:
Physical Activity Review; 2019, 7; 57-62
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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