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Jan
22
comment Proving that a sequence is bounded without knowing the sequence explicitly
What is the starting value?
Jan
6
comment Computing limits which involve square roots, such as $\sqrt{n^2+n}-n$
@Normal: I suggest you read this: meta.math.stackexchange.com/questions/1868/… and the linked question by Bill D. Special case vs general case is a common objection to such closings, but such closings [i.e. closed as minor variations] are fine IMO. It does not have to be an exact dupe.
Jan
4
comment Computing limits which involve square roots, such as $\sqrt{n^2+n}-n$
Please consider browsing the faq tag before posting a question. [To anyone who comes across this comment, I know this question is old]
Jan
4
comment Computing limits which involve square roots, such as $\sqrt{n^2+n}-n$
Possible duplicate of Limits: How to evaluate $\lim\limits_{x\rightarrow \infty}\sqrt[n]{x^{n}+a_{n-1}x^{n-1}+\cdots+a_{0}}-x$
Dec
18
comment Is $a^{\ln b} = b^{\ln a}$?
Take log on both sides and compare.
Dec
18
comment Lottery Math (different combinations)
Look at en.wikipedia.org/wiki/Steiner_system.
Dec
7
comment Proving the positivity of a twice-differentiable real-valued function
@Eklavya: Intermediate value theorem.
Nov
25
comment Existence of a self-complementary graph
@SalmonKiller: I have added more explanation...
Nov
21
comment Proof that $\lim_{n\rightarrow \infty} \sqrt[n]{n}=1$
@GniruT: Thanks! Glad you liked it.
Oct
26
comment Determine angle $x$ using only elementary geometry
@user236182: You are right.
Oct
2
comment The Modified Faro shuffle.
This site has latex support via mathjax: meta.math.stackexchange.com/questions/5020/…
Oct
2
comment Why a shuffling algorithm is not uniformly random between [1, N)?
Yeah, I use it. Bridge! (Thank you for that....)
Oct
2
comment Why a shuffling algorithm is not uniformly random between [1, N)?
+1: Nice way to look at it.
Sep
14
comment Estimating $\sum n^{-1/2}$
@achillehui: Euler Mc Laurin Summation gives that, and more (except for $\zeta(1/2)$).
Sep
11
comment Moebius function log sum
Are you asking for a proof of that? Where did you find that identity?
Sep
10
comment Recognizable vs Decidable
@EricLeschinski: I am not sure what you are trying to say. We are talking about Turing machines. Talking about programming languages seems irrelevant.
Sep
9
comment How can you prove that a function has no closed form integral?
@Mauris: Thanks.
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.
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?