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Mashable's Bethany Allard also reviewed these headphones and said that she, "Definitely wouldn't recommend an upgrade to any existing QC Ultra headphones users, but if you're buying into the line for the first time, the blend of comfort, noise cancellation, and sound is hard to beat, especially if you're keen on all-day wear."
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Each point \(p \in \mathbb{H}^n\) has tangent vectors \(\frac{\partial}{\partial x^i} in T_p M\) (which we write as the partial derivatives) at \(p\) given local coordinates (i.e. a basis \(\text{span}\{x^1,\dots,x^n\} = T_p M\)). The collection \(\bigl\{\frac{\partial}{\partial x^1}\big|_p,\dots,\frac{\partial}{\partial x^n}\big|_p\bigr\}\) forms a basis of \(T_pM\).