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 Oct 15 asked If $X$ and $Y$ are lognormal and $E[\ln X - \ln Y]=k$, what can we say about $E[X-Y]$? Jun 30 asked Is there a way to turn this summation into a matrix multiplication? Jun 7 asked What are some results that shook the foundations of one or more fields of mathematics? Feb 18 asked Given a vector $x\in \mathbb R^n$, how can we find $z\in \mathbb Z^n$ which is closest to a scalar multiple of $x$? Feb 6 asked What kind of algorithm might solve this type of optimization problem? Dec 11 asked How can I recursively approximate a moving average and standard deviation? Nov 25 asked Are these two definitions of the natural numbers equivalent? Jun 26 asked Sampling from a graph Jun 18 answered Relationship between Binomial and Bernoulli? Jun 18 answered Contraposition and law of excluded middle Jun 6 answered On prime(less)ness and composite(less)ness of 1 Apr 16 answered How do you evaluate $f(x_n)$? Apr 15 answered Question about the Continuum Hypothesis Apr 14 answered Let $n\ge 2$ be an integer. If $\gcd(a,b^n)=1$, then $\gcd(a,b)=1$ Apr 13 answered Every n × n-matrix A with real entries has at least one real eigenvalue. Apr 13 answered Writing Series as a Telescoping Series Apr 13 answered Proof by induction valid or not? Apr 13 answered basic conditional probability proof Apr 12 answered Prove $a_n = \begin{cases}1 & \text{if$n=2^k$for some$k\in N$}\\ 0 & \text{otherwise} \end{cases}$ diverges. Mar 13 answered Number of words in containing $0,1$