نتایج جستجو برای: first countable
تعداد نتایج: 1444949 فیلتر نتایج به سال:
The Proper Forcing Axiom implies that compact Hausdorff spaces are either first-countable or contain a converging $$\omega_1$$ -sequence.
At first sight, recursive saturation may seem an ‘unhappy marriage’ between model theory and recursion theory, as some authors put it. Nevertheless, it turns out to work wonderfully well with models of arithmetic. First and most important of all, since there are only countably many recursive sets, the number of recursive types over any infinite structure M is exactly card(M). So by an elementar...
in this paper, countable compactness and the lindel¨of propertyare defined for l-fuzzy sets, where l is a complete de morgan algebra. theydon’t rely on the structure of the basis lattice l and no distributivity is requiredin l. a fuzzy compact l-set is countably compact and has the lindel¨ofproperty. an l-set having the lindel¨of property is countably compact if andonly if it is fuzzy compact. ...
in this paper, we mainly investigate how the generalized metrizability properties of the remainders affect the metrizability of rectifiable spaces, and how the character of the remainders affects the character and the size of a rectifiable space. some results in [a. v. arhangel'skii and j. van mill, on topological groups with a first-countable remainder, topology proc. 42 (2013...
Currently, the most popular views about how to update de se or self-locating beliefs entail the one-third solution to the Sleeping Beauty problem. 2 Another widely held view is that an agent‘s credences should be countably additive. 3 In what follows, I will argue that there is a deep tension between these two positions. For the assumptions that underlie the one-third solution to the Sleeping B...
The concepts of semimartingales and their characteristic triples are introduced for stochastic processes taking their values in a locally compact second countable abelian group. It is proved that the third characteristic always exists and that the first two characteristics always exist when the group is compact. Any continuous additive Gaussian process in a locally compact second countable abel...
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