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 Jul 6 accepted For which $k \in \mathbb{R}$ will this be a euclidean vector space? Jul 5 asked For which $k \in \mathbb{R}$ will this be a euclidean vector space? Jul 4 comment Help understanding this example of a linear operator which rotates each vector $v$ about the z-axis by an angle $\theta$ [at]Jason: thank you! Jul 4 accepted Help understanding this example of a linear operator which rotates each vector $v$ about the z-axis by an angle $\theta$ Jul 3 comment Help understanding this example of a linear operator which rotates each vector $v$ about the z-axis by an angle $\theta$ @Mark: thank you for the comment, unfortunately I do not know the formulae for rotations in any dimension at the moment... Jul 3 asked Help understanding this example of a linear operator which rotates each vector $v$ about the z-axis by an angle $\theta$ Jul 1 comment Understanding this partial derivative problem thank you again! Jul 1 comment Understanding this partial derivative problem sorry, i had read your answer and thought it was a done deal, but i seem to still be stuck: taking the step you suggest, i get $\frac{\partial \theta}{\partial x} = - \frac{-3 \sin \theta}{e^{2r}} \frac{1}{3\sin^{2}\theta + 2\cos^{2} \theta}$. is there some way that i can change $3\sin^{2}\theta + 2\cos^{2}\theta$ into the expression $2+\sin^{2}\theta$ as in the solution above? Jul 1 accepted Understanding this partial derivative problem Jul 1 comment Understanding this partial derivative problem thank you for helping me with this arturo Jul 1 comment Understanding this partial derivative problem this definitely does help, thank you Jun 30 asked Understanding this partial derivative problem Jun 4 accepted Does this equality always hold? Jun 4 comment Does this equality always hold? thank you mixedmath Jun 4 comment Does this equality always hold? excellent, thank you Jun 4 comment Does this equality always hold? @Fabian: thank you Jun 4 asked Does this equality always hold? May 24 awarded Vox Populi May 15 revised What is the best way to show that no positive powers of this matrix will be the identity matrix? rolled back to a previous revision May 14 accepted Are bounded sequences always strictly less than some fixed number $M$?