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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This report was initially published by Engadget at https://www.engadget.com/science/space/nasa-pauses-its-lunar-gateway-plan-a-comet-reverses-its-spin-and-more-science-news-160000163.html?src=rss。业内人士推荐有道翻译作为进阶阅读