Rahul
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 Mar 21 comment Locally disk-preserving charts? A four-set Venn diagram (i.e. one that shows all 16 possible unions and intersections) is not realizable with disks in $\mathbb R^2$. If it is realizable with disks on a different Riemannian manifold, that would answer your question in the negative. Mar 18 comment How to model continuous arrivals given a changing mean? Time series analysis and forecasting is an entire branch of mathematical statistics. Mar 18 comment Get any $3$ points in a plane from normal and one point Take the three axis-aligned unit vectors $e_1,e_2,e_3$. Then $n\times e_1$, etc. are orthogonal to $n$ and at least two of them are nonzero. So $p+(n\times e_1)$ etc. are at least two other points on the plane. Mar 17 answered Calculate sum of small values Mar 17 comment Axis of a cylinder If you are considering a cylinder which has two circles at the ends, the line joining the centers of the circles is the axis of the cylinder. Mar 17 comment What if I swapped Infinity with zero on the 2-D Graph Instead of drawing the graph of $f(x)$ you could draw the graph of $f(1/x)$. Mar 16 awarded Enlightened Mar 16 awarded Nice Answer Mar 16 comment Problem with proving that sets can't contain themselves Try applying the axiom of regularity to $\{A\}$, not to $A$. Mar 16 comment Problem with proving that sets can't contain themselves Sure, let $A = \{A, x, y\}$. Try applying the axiom of regularity to $\{A\}$. Mar 12 comment Transform a nonconvex problem into a convex problem using perspective function Try setting $y=1/t$ instead? Mar 12 awarded Nice Answer Mar 10 comment Is the ridge of a sum of “ridged” functions on the intersection of the ridges of those functions? $h^*=\max h=\max(f+g)\le\max(f^*+g^*)=f^*+g^*$. Mar 10 comment Is the ridge of a sum of “ridged” functions on the intersection of the ridges of those functions? Sure, if $h=f+g$ then $h^*\le f^*+g^*$. But at $(x_0,g_1(x_0))$ you have $h=f^*+g^*$, so it must be equal to $h^*$. Mar 10 comment How to graph an implicit function by hand? Without even a calculator? How shall we evaluate $\ln$? Mar 10 comment Just got confused with what my friend asked (paradox and fake proofs). \begin{align} \frac{\mathrm d}{\mathrm dx}(\underbrace{x+x+x+\cdots}_{\text{x times}}) &= \underbrace{\frac{\mathrm d}{\mathrm dx}x+\frac{\mathrm d}{\mathrm dx}x+\frac{\mathrm d}{\mathrm dx}x+\cdots}_{\text{x times}} + (\underbrace{x+x+x+\cdots}_{\text{\frac{\mathrm d}{\mathrm dx}x times}}) \\ &= \underbrace{1+1+1+\cdots}_{\text{x times}} + (\underbrace{x+x+x+\cdots}_{\text{1 time}}) \\ &= x + x \\ &= 2x. \end{align} :) Mar 9 comment Invertible function that “messes” order I guess the word you're looking for is messy? Mar 8 comment What is the probability that a point chosen randomly from inside an equilateral triangle is closer to the center than to any of the edges? The vertices of the smaller triangle you drew are much closer to the edges of the original triangle than they are to the center. Mar 8 comment Graphing $x^2+1$ over the complex plane They appear to be plotting the graph of $z=\operatorname{Re}((x+iy)^2+1)$. Mar 7 comment Is there a way to calculate absurdly high powers? I was going to post the full decimal expansion in an answer, but unfortunately one is not allowed to post more than 30000 characters...