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seen Aug 24 at 6:45

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.
Apr
9
comment If $(x_0,y_0)$ is a critical point of a quadratic function $f(x,y)$ and $D < 0$, then near $(x_0,y_0)$, $f$ takes values above and below $f(x_0,y_0)$
Good question. The book defines a quadratic function g: R(n) -> R to be of the form g(h(1),...,h(n)) = Summation as i, j = 1 goes to n of a(ij)h(i)h(j) for an n x n matrix [a(ij)]
Apr
9
comment If $(x_0,y_0)$ is a critical point of a quadratic function $f(x,y)$ and $D < 0$, then near $(x_0,y_0)$, $f$ takes values above and below $f(x_0,y_0)$
Yes. My book does relate Taylor's theorem to Hessians, although it's quite confusing at the moment.
Apr
9
asked If $(x_0,y_0)$ is a critical point of a quadratic function $f(x,y)$ and $D < 0$, then near $(x_0,y_0)$, $f$ takes values above and below $f(x_0,y_0)$
Apr
9
accepted Find the point on the plane $2x - y + 2z = 20$ nearest the origin
Apr
9
asked Find the point on the plane $2x - y + 2z = 20$ nearest the origin
Apr
6
accepted Write a formula for the second derivative $\frac{\partial^2}{\partial t^2}(f\circ c) (t)$ using the chain rule twice