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Aug
25
awarded  Yearling
Aug
25
answered Why is the Kleene star of a null set is an empty string?
Aug
16
answered Matrix Commutativity
Jul
26
comment Even number being express as $4q$ or $4q+2$
The question is asking about writing $n$ as $4q$ or $4q+2$, so why would you start by using $5q$?
Jul
16
comment The $i^{th}$ prime in a given ring R
What properties do you want this order to have? In a finite ring, if 1 is (say) positive, and the sum of positives is positive, then all sums 1+1+1+...+1 would be positive. But eventually 1+1+1+...+1=0 in a finite ring.
Jul
6
answered Choosing a branch of the square root
Jul
5
comment How to show $\log_2 x \cdot \log_{0.25} x \cdot \log_{0.125} x \cdot \log_{16} x > \frac {2}3$?
At the very end, after $[\log_2{x}]^4 = 2^4$, you should get $|\log_2{x}| > 2$ so there are more solutions where $\log_2{x}$ is negative.
Jul
2
awarded  Curious
Jun
29
comment Branches of the complex logarithm
@user100106 See some details for (i) edited in.
Jun
29
revised Branches of the complex logarithm
added 624 characters in body
Jun
29
reviewed Close Computing conditional expectation.
Jun
29
reviewed Close Evaluation of Integral $ \int \sqrt{\sin x}\; dx$
Jun
29
reviewed Leave Open Show that $\sum\limits_n1/x_{n}^{2} = 1/10$ where $x_{n}$ is the $n^{\text{th}}$ positive root of $\tan x = x$
Jun
29
reviewed Close Find all values that make the expression a perfect cube
Jun
29
reviewed Leave Open $e^{i\theta}$ $=$ $\cos \theta + i \sin \theta$, a definition or theorem?
Jun
29
answered Branches of the complex logarithm
Jun
28
comment Polynomials - getting wrong answer using Euclidean algorithm
Don't forget that the GCD is only defined up to a constant factor. This doesn't completely explain your discrepancy though (459 has a factor of 17 which is nowhere to be found in $1/6 x + 1/4$).
Jun
27
comment What do I not understand about one-to-one functions?
@user667648 An injective function is definitely a function, but a function need not be an injective function...
Jun
27
revised Solve for Radian Exactly
TeX-ify and fix tags
Jun
26
comment Symmetric points in $\overline{\mathbb C}$ problem
@user100106 The image of a line under a Möbius transformation is either a line or a circle. Uniqueness follows from the fact that the perpendicular bisector between 2 points is unique.