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For every infinite cardinal with we construct a group of cardinality such that (i) is -Shelah, which means that for any subset of cardinality ; (ii) is absolutely -closed and projectively -discrete, which means that for every homomorphism to a topological semigroup the image is a closed discrete subspace of , (iii) cannot be covered by finitely many algebraic subsets, i.e., subsets of the form for some .

生成讲解博客的中文版本

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