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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 \(X\).
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14:51, 3 марта 2026Россия
1926年，根据菲茨杰拉德原著改编的同名电影《了不起的盖茨比》。资料图