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Dec
11
suggested approved edit on Evaluate $\int\frac{1}{r \ln(r)} \ dr$
Oct
27
revised Proving that $2^{2^n} + 5$ is always composite by working modulo $3$
Tex formatting
Oct
27
suggested approved edit on Proving that $2^{2^n} + 5$ is always composite by working modulo $3$
Sep
2
revised How to find eigenvectors/eigenvalues of a matrix where each diagonal entry is scalar $d$ and all other entries are $1$
Tex formatting, edited phrasing of the question and edited title
Sep
2
suggested approved edit on How to find eigenvectors/eigenvalues of a matrix where each diagonal entry is scalar $d$ and all other entries are $1$
Aug
26
comment Proving $n^4 + 4 n^2 + 11$ is $16k$
sos440's comment is better justified by noticing that if $n$ is even, then so is $n^4+4n^2$. Hence $n^4+4n^2+11$ has to be odd (since $11$ is an odd number).
Aug
24
revised Solving an augumented matrix (A|B) with same matrix coeff
Tex formatting and edits in Phrasing
Aug
24
suggested approved edit on Solving an augumented matrix (A|B) with same matrix coeff
Aug
24
revised Prove that if $n$ is a positive integer then $2^{3n}-1$ is divisible by $7$.
added 3 characters in body
Aug
23
revised Prove that if $n$ is a positive integer then $2^{3n}-1$ is divisible by $7$.
added 593 characters in body
Aug
23
comment Prove that if $n$ is a positive integer then $2^{3n}-1$ is divisible by $7$.
So if $2^{3n}$, when divided by $7$ leaves a remainder of $1$, what remainder must $2^{3n}-1$ (which is, as you may have noticed, $1$ less than $2^{3n}$) leave when divided by 7?
Aug
23
answered Prove that if $n$ is a positive integer then $2^{3n}-1$ is divisible by $7$.
Aug
22
revised Is $\sum \sin{\frac{\pi}{n}}$ convergent?
Tex formating
Aug
22
suggested approved edit on Is $\sum \sin{\frac{\pi}{n}}$ convergent?
Aug
20
comment Why isn't math on the sine of angles the same as math on the angles in degrees?
@tomasz, "The thing is, before applying a „rule”, you should verify if it is actually true." that is exactly my point. I don't know why you disagree :)
Aug
20
comment Why isn't math on the sine of angles the same as math on the angles in degrees?
(+1) for the 'In maths it's the single most important thing to stick to given rules and not accidentally "invent" new ones.'
Aug
15
answered A question on iterated sums
Aug
15
revised Proving that $\mu$ is $\sup S$
added 8 characters in body
Aug
14
revised Proving that $2^{2^n} + 5$ is always composite by working modulo $3$
deleted 591 characters in body
Aug
14
comment Proving that $2^{2^n} + 5$ is always composite by working modulo $3$
First of all, please do note that I am not comparing my answers with others. Now that I read my answer, I realize that I badly phrased my little disclaimer :) What I mean to say is I have included parts like "...this means that any even power of 2 is 1 greater than some multiple of 3..." in my answer which are obvious. So I guess I need to edit/ delete the disclaimer, eh?