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Jul
21
revised For any integer $n>1$ exist integers $a$ and $b$ so that $\tau(a)+\tau(b)=n$
edited tags
Jul
19
comment Solving recurrence $T(n) = T(\lceil n/2 \rceil) + T(\lfloor n/2 \rfloor) + \Theta(n)$
@IntrepidTraveller: We are considering a mathematical recurrence, it could be space/time complexity or even something else (like number of comparisons). Besides, we can replace $T$ in the above post with $G$ where $G(n) = T(n) - T(1)$ and for that $G$, $G(1)$ is indeed $0$. $T(1) = 0$ is taken to simplify the math, and does not change the end result.
Jul
8
revised What is $x$ if $\{x\}+\{\frac{1}{x} \}=1$ ? ({} - fractional part)?
edited tags
Jul
8
revised What is $x$ if $\{x\}+\{\frac{1}{x} \}=1$ ? ({} - fractional part)?
edited tags; edited tags
Jul
4
revised If, $x+y=1, x^2+y^2=2$ Find $x^7+y^7=??$
edited tags
Jun
13
awarded  Favorite Question
Jun
11
awarded  Nice Answer
Jun
9
comment How do I solve inequalities of the form $\left|\frac{f(x)}{g(x)}\right| \geq 1$?
@StevenGregory: You can. Notice the absolute values...
Jun
9
comment If $A,B,C,D$ are complex numbers on the unit circle with $A+B+C+D=0$, then they form a rectangle
@YotasTrejos: It is not a square. Basically, given $A$, you just reflect it along x and y axis, and then take the negative to get the four corners of the quadrilateral. Now take $A$ close to the y axis and far far away from the x axis. Do you still get a square?
May
7
revised First number $\ge n$ that is divisible by $k$?
edited tags
May
4
comment $g^q-q$ and $g^q-gq$ are primitive roots modulo $q^2$
Using $g$ and $q$ is confusing!
Apr
26
comment Reduction from Hamiltonian cycle to Hamiltonian path
@graphtheory92: Seems valid to me. What are your concerns?
Apr
17
revised Compute $\int_{0}^{\infty}\frac{x \log(x)}{(1+x^2)^2}dx$
edited tags
Apr
17
revised Proving that $\lim_{n\rightarrow\infty}n(a_{n+1}-a_{n})=1 \implies a_n$ diverges to $\infty$
edited title
Apr
17
comment Proving that $\lim_{n\rightarrow\infty}n(a_{n+1}-a_{n})=1 \implies a_n$ diverges to $\infty$
Please use more informative titles.
Apr
17
revised Infinite series $\sum_{n=1}^{\infty}nx^{n+1}$ does not comply to any of my (known) tests
edited title
Apr
17
revised Showing that $\sum\limits_{n=1}^{\infty} (a_1+2a_2+…+na_n)/n(n+1) = \sum\limits_{i=1}^n a_n $
edited title
Apr
17
comment How can I find if $\sum_{n=1}^\infty {n! \over 10^n} $ converges or diverges?
Please use more informative titles. The previous title you had, was on par with "Help!".
Apr
17
revised How can I find if $\sum_{n=1}^\infty {n! \over 10^n} $ converges or diverges?
edited title
Apr
17
revised Proof that $\lim \frac{a_n}{1+a_n^2} = 0 \implies \lim a_n = 0$
deleted 2 characters in body; edited title