Patrick Li
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 Apr10 awarded Popular Question Mar31 awarded Nice Question Dec26 reviewed Approve How nuclear norm is convex whereas weighted nuclaer norm is not? Dec26 reviewed Approve $G^k$ is $k$-connected Dec26 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 Dec15 awarded Caucus Nov19 awarded Notable Question Sep30 awarded Explainer Sep26 reviewed Approve Prove that this is a metric space? Sep25 awarded Yearling Sep20 accepted Number of ways to put $k$ different numbers in $n$ place Sep20 reviewed Approve property of two numbers such that their exponential and product are the same Sep12 reviewed Approve Combinatorics Domain Names Sep2 comment Number of ways to put $k$ different numbers in $n$ place Sorry that my expression was not very clear before. Each place must have one number. Please see the edited post. Sep2 revised Number of ways to put $k$ different numbers in $n$ place added 119 characters in body Sep2 comment Number of ways to put $k$ different numbers in $n$ place Yes, each number can appear more than once. Sep2 asked Number of ways to put $k$ different numbers in $n$ place Jul2 awarded Curious Jan21 awarded Notable Question Dec17 awarded Popular Question