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We present a 2-dimensional Peano continuum with the following properties: (1) There is a universal covering projection with uncountable fundamental group ; (2) For every , there is a covering projection such that ; (3) There is no universal covering projection ; (4) The universal object in the category of fibrations with unique path lifting (and path-connected total space) over has trivial fundamental group ; (5) is not a path component of an inverse limit of covering projections over .

生成讲解博客的中文版本

生成AI智能校验的中文版本