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The Mutual Exclusion Problem  Part I: A Theory of Interprocess Communication
, 2000
"... A novel formal theory of concurrent systems is introduced that does not assume any atomic operations. The execution of a concurrent program is modeled as an abstract set of operation executions with two temporal ordering relations: "precedence" and "can causally a#ect". A primitive interprocess comm ..."
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Cited by 47 (4 self)
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A novel formal theory of concurrent systems is introduced that does not assume any atomic operations. The execution of a concurrent program is modeled as an abstract set of operation executions with two temporal ordering relations: "precedence" and "can causally a#ect". A primitive interprocess communication mechanism is then defined. In Part II, the mutual exclusion is expressed precisely in terms of this model, and solutions using the communication mechanism are given. Contents 1 Introduction 2 2 The Model 2 2.1 Physical Considerations . . . . . . . . . . . . . . . . . . . . . 3 2.2 System Executions . . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 HigherLevel Views . . . . . . . . . . . . . . . . . . . . . . . . 7 3 Interprocess Communication 9 4 Processes 14 5 MultipleReader Variables 17 6 Discussion of the Assumptions 18 7 Conclusion 19 1 1 Introduction The mutual exclusion problem was first described and solved by Dijkstra in [3]. In this problem, there is a collection...
Worlds in the Everett Interpretation
 Studies in the History and Philosopy of Modern Physics
, 2002
"... This is a discussion of how we can understand the worldview given to us by the Everett interpretation of quantum mechanics, and in particular the rôle played by the concept of ‘world’. The view presented is that we are entitled to use ‘manyworlds ’ terminology even if the theory does not specify t ..."
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Cited by 17 (4 self)
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This is a discussion of how we can understand the worldview given to us by the Everett interpretation of quantum mechanics, and in particular the rôle played by the concept of ‘world’. The view presented is that we are entitled to use ‘manyworlds ’ terminology even if the theory does not specify the worlds in the formalism; this is defended by means of an extensive analogy with the concept of an ‘instant ’ or moment of time in relativity, with the lack of a preferred foliation of spacetime being compared with the lack of a preferred basis in quantum theory. Implications for identity of worlds over time, and for relativistic quantum mechanics, are discussed.
Hence we obtain for the first few days the following lengths of time:
, 2001
"... Abstract. The early stage of the Universe is discussed and the time lengths of its first days are given. If we denote the Hubble time in the zerogravity limit by τ (approximately 12.16 billion years), and Tn denotes the length of the nth day, then we have the very simple relation Tn = τ/(2n − 1). ..."
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Abstract. The early stage of the Universe is discussed and the time lengths of its first days are given. If we denote the Hubble time in the zerogravity limit by τ (approximately 12.16 billion years), and Tn denotes the length of the nth day, then we have the very simple relation Tn = τ/(2n − 1). Hence we obtain for the first days the following lengths of time: T1 = τ, T2 = τ/3, T3 = τ/5, etc. In this Note we calculate the lengths of days of the early Universe, day by day, from the first day after the Big Bang on up to our present time. We find that the first day actually lasted the Hubble time in the limit of zero gravity. If we denote the Hubble time in the zerogravity limit by τ which equals about 12.16 billion years and Tn denotes the length of the nth day in units of times of the early Universe, then we have a very simple relation
FiveDimensional Brane World Theory
, 2001
"... A fivedimensional cosmological theory of gravitation that unifies space, time and velocity is presented. Within the framework of this theory we first discuss some general aspects of the universe in five dimensions. We then find the equations of motion of the expanding universe and show that it is a ..."
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A fivedimensional cosmological theory of gravitation that unifies space, time and velocity is presented. Within the framework of this theory we first discuss some general aspects of the universe in five dimensions. We then find the equations of motion of the expanding universe and show that it is accelerating. This followed by dealing with the important problem of halo dark matter around galaxies by deriving the equations of motion of a star moving around the field of a sphericallysymmetric galaxy. The equations obtained are not Newtonian; rather, the TullyFisher formula is obtained. The cosmological constant is subsequently discussed: our theory predicts that Λ ≈ 3H 2 0 ≈ 1.934 × 10 −35 s −2, in agreement with experimental results obtained by the HighZ Supernova Team and the Supernova Cosmology Project. Finally we derive a formula for the cosmological redshift in which appears the expression (1−ΩM), thus enabling us to determine the kind of the universe by means of the cosmological redshift. We find that ΩM should be less than 1 in order not to contradict redshift measurements, and therefore the universe is open.
Hence we obtain for the first six days the following lengths of time:
, 2000
"... The early stage of the Universe is discussed and the time lenghts of its first six days, as well as its age, are given. There seems to be no contradiction with the Bible’s ascertain that the Universe was created in six days. 1 Scientists have in recent years adopted the picture that the Universe was ..."
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The early stage of the Universe is discussed and the time lenghts of its first six days, as well as its age, are given. There seems to be no contradiction with the Bible’s ascertain that the Universe was created in six days. 1 Scientists have in recent years adopted the picture that the Universe was created in a single event of plasma explosion, called the Big Bang. This approach remarkably conforms with the Bible’s description of the creation of the Universe. However, there are still doubts about the meaning, mentioned in the Bible, that the Universe was created in six days. We actually know from the study of anthropology and cosmology that any development of the kind mentioned in the Bible takes millions or billions of years. We show in the following that the viewpoint of the Bible is actually compatible with the theory of cosmology – the days of our life now are not equal to the days at the time of the creation of the Universe. In this note we calculate the lengths of days of the early Universe, day by day, from the first day on up to our present time. We find that the first day actually lasted the Hubble time in the limit of zero gravity. If we denote the Hubble time in the zerogravity limit by τ which equals 11.5 billion years and Tn denotes the length of the nth day in units of times of the early Universe, then we have a very simple relation