منابع مشابه
Every Countable Model of Set Theory Embeds into Its Own Constructible Universe
The main theorem of this article is that every countable model of set theory 〈M,∈ 〉, including every well-founded model, is isomorphic to a submodel of its own constructible universe 〈L ,∈ 〉. In other words, there is an embedding j : M → L that is elementary for quantifier-free assertions. It follows from the proof that the countable models of set theory are linearly pre-ordered by embeddabilit...
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While many international organisations have independent evaluations, including the International Monetary Fund (IMF) and World Health organization (WHO), uniquely the World Bank in its 2015 World Development Report sought to ascertain the potential biases that influence how its staff interpret evidence and influence policy. Here, we describe the World Bank’s study design, including experiments ...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1921
ISSN: 0036-8733
DOI: 10.1038/scientificamerican01221921-65