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Jun
16
comment Get Rank from two Ranks
What does this mean -- "first rank" and "second rank"?
Jun
16
comment How to find number which is greater?
@Winther thank you, fixed
Jun
16
comment How to find number which is greater?
@Bhaskara-III see update
Jun
16
comment How to find number which is greater?
@Bhaskara-III do you know calculus -- derivatives?
Jun
16
comment Interpolation between 2 points on the perimeter of a circle?
if the problem is with the use of $\sin$ and $\cos$, you can approximate them using 3-4 terms in the Taylor series
Jun
16
comment Interpolation between 2 points on the perimeter of a circle?
What does it mean "without use of angles"? Parameterize your curve as $x(t) = \cos (t\pi/2), y(t) = \sin (t\pi/2)$ with $0 \le t \le 1$ then $t=1/2$ comes out to $x = y = \sqrt{2}/2$
Jun
16
comment Prove that $2^{mn}$ is always greater than or equal to $m^n$
@coffeemath yes
Jun
16
comment Probability that running maximum $M(t) > 2B(t)$, where $B(t)$ is Brownian Motion starting at 0
An idea would be to condition on $M(t)$, converting $M(t)$ events into hitting time events (remember if $M(t) = x$ then hitting time of $x$ must be before $t$ -- i.e. $\tau_x < t$, and also $\mathbb{P}[\tau_x < t] = 2\mathbb{P}[B_t > x]$.) Not sure how to deal with joint distribution of $B_t,M_t$ though
Jun
15
comment Closed Form Solution for Minimization involving Standard Normal CDF and PDF
@Did it looked differently when i wrote the solution, i made a mistake. not sure about the other question
Jun
11
comment Solving this Inequation
@MikhaelM please see update, taking logs making things very basic
Jun
11
comment converting asymptotic little-oh into big-oh
If $f(n) \cdot n^{1/4-\epsilon} \to 0$ then $f(n) = O(n^{-1/4})$, not $O(n^{1/4})$ as you have claimed
Jun
11
comment How many arithmetic operations are required to do this polynomial division?
depnds on the degree of $p$?
Jun
11
comment converting asymptotic little-oh into big-oh
in std notation, $f(n) = O(n^{-1/4})$
Jun
11
comment Probability of not choosing from a lot
that's not what it says in the question -- "10 out of every 1000 are defective" but i can see how you want to interpret it like that. i wasn't the one who downvoted btw
Jun
11
comment Probability of not choosing from a lot
@BelginFish see the update...
Jun
11
comment Probability of not choosing from a lot
this is wrong. when you've picked the first one, the odds for the second one change
Jun
11
comment Probability of not choosing from a lot
Please add your own thoughts on the problem. People here don't usually like to do your hw for you
Jun
11
comment Find $\lim\limits_{x\to \infty} \frac{x\sin x}{1+x^2}$
@JesterTran yes. Exactly
Jun
11
comment Find $\lim\limits_{x\to \infty} \frac{x\sin x}{1+x^2}$
@JesterTran LHospital cannot be used when limits don't exist. You need too make s bonding argument like shown in other answers
Jun
11
comment Find $\lim\limits_{x\to \infty} \frac{x\sin x}{1+x^2}$
@JesterTran it is neither $+\infty$ or $-\infty$, it does not exist...