Javier
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 Oct 25 comment Suppose $S$ is a minimal surface, show that the gaussian curvative is negative on all interior points I just clicked "edit" and then "roll back" on the first revision, if that's what you're asking. Oct 25 comment Suppose $S$ is a minimal surface, show that the gaussian curvative is negative on all interior points I rolled the question back to what it was originally. You should probably add a disclaimer to your answer so people don't start downvoting you. Oct 25 revised Suppose $S$ is a minimal surface, show that the gaussian curvative is negative on all interior points edited title Oct 25 awarded Cleanup Oct 25 revised Suppose $S$ is a minimal surface, show that the gaussian curvative is negative on all interior points rolled back to a previous revision Oct 25 comment Suppose $S$ is a minimal surface, show that the gaussian curvative is negative on all interior points Also, what sort of course are you following that you can talk about minimal surfaces but don't know the derivative of $x^2+x$? Oct 25 comment Suppose $S$ is a minimal surface, show that the gaussian curvative is negative on all interior points Please don't change your question to something else. If you have a new question, ask a new question. Oct 25 answered 3-D function that follows an inverse square law, but has an overall integral equal to a constant Oct 24 awarded Yearling Oct 15 revised What's the integral of $\frac{-4x}{1+2x}$? latex'd Oct 15 comment What's the integral of $\frac{-4x}{1+2x}$? Constants don't matter when doing integrals. In this case, the $-1$ gets absorbed into the $+C$ that you should have put when doing the integral. Oct 14 answered Integration by parts: $\int xe^{-x}dx$ Oct 14 comment How do we explain to students that division by a vector does not make sense? It certainly depends on what your multiplication is. Oct 11 answered Geometric significance of $\sqrt{A^2 + B^2}$ in general equation of line, if any? Oct 11 revised Geometric significance of $\sqrt{A^2 + B^2}$ in general equation of line, if any? typo Oct 6 comment How to tell if multivariable function is odd? You just do. It's something you get used to after a while. After all, it's usually pretty easy to tell at a glance whether a function is odd. Oct 5 comment Let $f,g$ be two distinct functions from $[0,1]$ to $(0, +\infty)$ such that $\int_{0}^{1} g = \int_{0}^{1} f$. Are those powers or derivatives? Oct 1 revised Is the function $f(x)= {\sin x \over x}$ uniformly continuous over $\mathbb{R}$? added 11 characters in body Oct 1 awarded Benefactor Oct 1 accepted Why do we think of a vector as being the same as a differential operator?