Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00599-5
2026-03-03 00:00:00:0吕晓勋3014315810http://paper.people.com.cn/rmrb/pc/content/202603/03/content_30143158.htmlhttp://paper.people.com.cn/rmrb/pad/content/202603/03/content_30143158.html11921 “虚拟”背后是实功（现场评论·新春走基层）
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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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