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Sep
14
revised Number of Lattice Points in a Triangle
edited title
Sep
14
comment Number of Lattice Points in a Triangle
You can easily figure out which one is correct by putting in some small values for $a$ and $b$.
Sep
13
comment Intuition fail with normal subgroups
The second sentence in (b) doesn't make sense at all; can you explain what you are thinking?
Sep
13
revised Which theorem can I use for prove if a matrix is invertible or not?
edited tags
Sep
13
revised Determine the number of real roots of the system.
better tagging
Sep
13
answered How do I compute the normaliser of a group G, considered as a set, in the group of set bijections of G?
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