A new study published in the Annals of Neurology is among the first to link sound sensitivity in people with chronic back pain to measurable changes in the brain - and to show those changes can improve with therapy.

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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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Let’s try 3-by-3 now:

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