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23h
answered Are there infinitely many $k$ for which $\frac{\sigma(k)}{k}$ is a rational square where $ \sigma(k) $ and $k$ both are square?
1d
answered Proving that a sequence converges or diverges
1d
answered Does there exist a $z\in \Bbb R$ such that $\sin z=t \in \Bbb T$?
1d
comment How to prove that $(a-b) \mod N = a \mod N + ((-b) \mod N)$?
What is the exact definition of $ x \bmod N$ that you are working with?
2d
comment Fruitful advice to get back to study Mathematics again?
This question is not appropriate for this site. Contrary to anomaly's suggestion, it's not appropriate for academia.stackexchange either. You might consider asking on a site or place which allows/encourages discussion, such as the chat here, reddit's /r/math, or quora.
2d
answered If $p$ is a prime number and $p\equiv 1(mod 4)$, (show that) there exist integers $a$ and $b$ such that $a^{2}+b^{2}=p$.
Jul
28
awarded  Nice Answer
Jul
28
answered Find $\int_0^1(\ln x)^n\hspace{1mm}dx$
Jul
27
revised Is $1992! - 1$ prime?
deleted 52 characters in body; edited tags; edited title
Jul
26
revised Determine if $ \sum_{n \geq 2} \frac{1}{\sqrt[n]{\ln n}}$ congerges
added 13 characters in body; edited tags; edited title
Jul
26
answered Determine if $ \sum_{n \geq 2} \frac{1}{\sqrt[n]{\ln n}}$ congerges
Jul
24
awarded  Revival
Jul
23
answered Intersection of subgroup and normal subgroup
Jul
23
answered Proof the quotient and remainder exists in $\mathbb{Z}^+$.
Jul
20
comment Intuition behind calculus notation
We chose this notation because (sometimes) it behaves and cancels like a fraction would, such as anything involving the chain rule.
Jul
18
comment First whole number solution for linear equation
@johannesvalks I have a certain organizational scheme in my answers, which I denote by the four suits from decks of cards. A $\diamondsuit$ means (to myself) that I've given a complete, direct view that, were I grading, would receive almost full marks. It looks a bit like the qed square, which is advantageous. $\spadesuit$ and $\clubsuit$ are saved for extraneous or side claims, often as lemmas and propositions that either lead to side avenues, or etc. $\heartsuit$ is saved for the best of answers that, in short, I love. Harmless organization.
Jul
18
answered First whole number solution for linear equation
Jul
18
answered If the euclidean algorithm is used to solve an equation ( i.e., $ax = b \mod(z)$) is the solution unique?
Jul
18
answered Showing certain sum as a Riemann-Stieltjes integral
Jul
17
comment How much water could be stored?
The easiest way to be able to fill both tanks up fully would be to connect the hole on the top of the small tank to the large tank. So one pipe would feed the large tank, which would have another pipe feeding the small tank. Of course, getting the water out might be annoying. But it's just as annoying as the presented problem (there isn't a way).