High Quality Content by WIKIPEDIA articles! In mathematics, more specifically algebraic topology, a covering map is a continuous surjective function p a from a topological space, C, to a topological space, X, such that each point in X has a neighbourhood evenly covered by p. This means that for each point x in X, there is associated an ordered pair, (K, U), where U is a neighborhood of x and where K is a collection of disjoint open sets in C, each of which gets mapped homeomorphically, via p,...
High Quality Content by WIKIPEDIA articles! In mathematics, more specifically algebraic topology, a covering map is a continuous surjective function p a from a topological space, C, to a topological space, X, such that each point in X has a neighbourhood evenly covered by p. This means that for each point x in X, there is associated an ordered pair, (K, U), where U is a neighborhood of x and where K is a collection of disjoint open sets in C, each of which gets mapped homeomorphically, via p, to U (as shown in the image). In particular, this means that every covering map is necessarily a local homeomorphism. Under this definition, C is called the covering space of X.
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Эта книга включает в себя известные корейские народные сказки ("Симчхон", "Сказка о Кхончви и Пхатчви" и "Хынбу и Нольбу"), которые, обладая восточным очарованием, в то же время исповедуют близкие российскому читателю ценности: дружбу, преданность, любовь к ближнему, взаимовыручку. Каждая сказка снабжена художественным переводом на русский язык и вопросами для проверки понимания прочитанного. В конце...
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