منابع مشابه
On a Problem of Straus
Throughout this paper we use the following notation: {x} denotes the fractional part of x. The distance from x to the nearest integer is denoted by ‖x‖: ‖x‖ = min({x}, 1 − {x}). The cardinality of the finite set S is denoted by |S|. The counting functions of the finite sets A,B, . . . of nonnegative integers are denoted by A(x), B(x), . . . so that, e.g., A(x) = |A ∩ {1, 2, . . . , [x]}|. If A ...
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During the late summer of 1979, Ernst Mayr and I (Figure 1) had finished editing The Evolutionary Synthesis: Perspectives on the Unification of Biology [1]. He knew that I was working on a long essay about Theodosius Dobzhansky and also planning a book about Sewall Wright. From his farm in Wilton, New Hampshire, Ernst handwrote me a letter (Figure 2) from which this excerpt is taken: ‘In your w...
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Years ago Einstein and Straus (ES) showed that it is possible to match a static Schwarzschild region to an external expanding Friedmann universe. This model is extended in this work to a spacetime of arbitrary dimensions. Frequency shift of radiation coming from the boundary of the two spacetimes is calculated. Depending on the relative magnitude of gravitational and doppler effects our model g...
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Most economic models are based on the self-interest hypothesis that assumes that all people are exclusively motivated by their material self-interest. In recent years experimental economists have gathered overwhelming evidence that systematically refutes the self-interest hypothesis and suggests that many people are strongly motivated by concerns for fairness and reciprocity. Moreover, several ...
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ژورنال
عنوان ژورنال: Linear Algebra and its Applications
سال: 1985
ISSN: 0024-3795
DOI: 10.1016/0024-3795(85)90263-0