TheJoker
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 Dec 3 answered Complex solutions of $\sin z = i \alpha \cos z$ Nov 18 answered In terms of complexity, is there a quicker way of checking if a matrix is nonsingular than computing the determinant? Nov 15 answered Where does the Chi-square equation come from? Nov 15 answered Finding coefficients of quadratic given one tangent and point on the curve Nov 15 answered What is degree of freedom in statistics? Nov 15 answered simplify natural logarithm Nov 15 answered Finding the locus Nov 15 answered $I_m - AB$ is invertible if and only if $I_n - BA$ is invertible. Nov 15 answered Positive integers less than $N$ not divisible by $4$ or $6$ Nov 13 answered Example of a general random variable with finite mean but infinite variance Nov 11 answered Good examples for mathemathical problems/statements that are easely solvable/provable in one theory and hard to solve/prove in another Nov 11 answered Choosing the better of two estimators Nov 9 answered Normal Approximation to find probability of stopping at a red light at least 15 times Oct 13 answered An example of the maximum of $f(x)$ and the maximum of $g(x)$ does not to equal to the maximum of $(f+g)(x)$ Oct 13 answered Let $m \in \mathbb Z, m>1$, then $\cos(2 \pi/m) \in \mathbb Q$ if and only if $m \in \{1,2,3,4,6\}$. Oct 13 answered number of integral solutions for $x^2+y^2=5^k$ Oct 11 answered Sets forming orthonormal basis Oct 11 answered Probability mass function and conditional probabilities Oct 10 answered An angle $\theta$ can be trisected if and only if $4x^3-3x+\cos\theta$ is reducible over $\mathbb{Q}(\cos\theta)$ Oct 9 answered Distribution of Poisson variable conditional on a Gamma variable