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 Oct 18 awarded Popular Question Dec 11 awarded Caucus Dec 11 awarded Supporter Dec 1 accepted Random Walk on Clock Hands Dec 1 revised Random Walk on Clock Hands deleted 2 characters in body Dec 1 asked Random Walk on Clock Hands Jul 2 awarded Curious Oct 8 accepted Can someone explain these matrix operations to me? Oct 6 revised Can someone explain these matrix operations to me? edited body Oct 6 asked Can someone explain these matrix operations to me? May 20 accepted Find the volume of the region bounded by $z = x^2 + y^2$ and $z = 10 - x^2 - 2y^2$ May 20 asked Find the volume of the region bounded by $z = x^2 + y^2$ and $z = 10 - x^2 - 2y^2$ Apr 23 accepted Find the point or points on C closest to the origin. Apr 23 accepted Show that , at a local max or min of ||r(t)||, the vector r'(t) is perpendicular to r(t) Apr 19 asked Show that , at a local max or min of ||r(t)||, the vector r'(t) is perpendicular to r(t) Apr 19 accepted Show that dB/dt . B = 0 Apr 19 asked Show that dB/dt . B = 0 Apr 18 accepted What is the gradient of $\frac{1}{2}(Ax)\cdot x$ if $A$ is a nonzero symmetric $3\times 3$ matrix Apr 18 asked What is the gradient of $\frac{1}{2}(Ax)\cdot x$ if $A$ is a nonzero symmetric $3\times 3$ matrix Apr 9 asked Find the point or points on C closest to the origin.