TheJoker

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40 Posts

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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
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