Definition 3 A universal cover of a topological space \(X\) is a covering space \(\tilde{X}\) of \(X\) that is simply connected, meaning that it has no nontrivial loops. The universal cover is unique up to homeomorphism and serves as a “universal” object in the category of covering spaces of \(X\).
Ранее прибывшая из Эмиратов россиянка описала эмоции словами «хочется целовать землю родную». По ее словам, находясь в Абу-Даби, она слышала лишь хлопки и сирены.，详情可参考同城约会
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When The Brits announced that Robbie Williams would be leading a tribute to the Prince Of Darkness™ Ozzy Osbourne, it's fair to say a few people scratched their heads.