I saw from a book that if G is infinite, then when considering G-covering: $p:X'\to X$, the P-th Betti number of $X'$ can be infinite. Can you give me an example of that. Also I am curious why we need to consider the G-covering.
2026-02-23 04:03:32.1771819412
An example of infinite Betti number refers to G-covering, and the motivation of G-covering
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