منابع مشابه
Around splitting and reaping
We prove several results on some cardinal invariants of the continuum which are closely related to either the splitting number s or its dual, the reaping number r.
متن کاملReaping Numbers of Boolean Algebras
A subsetA of a Boolean algebra B is said to be (n,m)reaped if there is a partition of unity P ⊂ B of size n such that |{b ∈ P : b∧a 6= ∅}| ≥ m for all a ∈ A. The reaping number rn,m(B) of a Boolean algebra B is the minimum cardinality of a set A ⊂ B\ {0} such which cannot be (n,m)-reaped. It is shown that, for each n ∈ ω, there is a Boolean algebra B such that rn+1,2(B) 6= rn,2(B). Also, {rn,m(...
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Positive and negative side effects of economic activities—“externalities” in the language of economists—are universal in the energy sector. Coal-fired power plants not only produce electricity, but also CO2, which contributes to global warming, and local air pollutants such as sulfur dioxide (SO2), which have adverse health effects on the population living downwind of the smoke stacks. The stud...
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Background The objective was to evaluate whether extending the embryo culture period from 2 to 3 days would yield a more optimal selection of viable embryos, thereby increasing the pregnancy rat. MaterialsAndMethods We have retrospectively analyzed pregnancy rates in the patients who had embryo transfer either on day 2 (582 patients) or on day 3 (387 patients) post-insemination over a 10-month ...
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ژورنال
عنوان ژورنال: Mechanical Engineering
سال: 2000
ISSN: 0025-6501,1943-5649
DOI: 10.1115/1.2000-may-6