Patrick Li
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 Dec 24 comment Graphing Parabolas ( finding area) @Daniel That's how you solve for the intersection points. At the intersection points, $y$ values from two curves are equal. Dec 24 comment Graphing Parabolas ( finding area) You need to first solve for the coordinates of the two intersection points, and then calculate the area of the triangle Dec 24 comment Graphing Parabolas ( finding area) @JanEerland The triangle formed by the origin and two intersection points. Dec 24 revised Graphing Parabolas ( finding area) added 4 characters in body Nov 25 awarded Notable Question Nov 11 comment Sheldon Cooper Primes There is an article about Sheldon Number in the November 2015 issue of Math Horizons. Sep 25 awarded Yearling Aug 25 awarded Famous Question May 16 awarded Nice Question Apr 10 awarded Popular Question Mar 31 awarded Nice Question Dec 26 reviewed Approve How nuclear norm is convex whereas weighted nuclaer norm is not? Dec 26 reviewed Approve $G^k$ is $k$-connected Dec 26 comment Finding variance of the sample mean of a random sample of size n without replacement from finite population of size N. This is the variance of the mean of a simple random sample in survey sampling. You could find the proof on an introductory book on sampling. For example, home.iitk.ac.in/~shalab/chapter2-simple-random-sampling.pdf Dec 15 awarded Caucus Nov 19 awarded Notable Question Sep 30 awarded Explainer Sep 26 reviewed Approve Prove that this is a metric space? Sep 25 awarded Yearling Sep 20 accepted Number of ways to put $k$ different numbers in $n$ place