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Feb
20
comment Writing $A(t)=1+S_1S_2^{-1}$ as an Ito diffusion process.
@Did i removed everything, the only material problem is what is after, since that is OP's example. But why didn't they make sense?
Feb
20
comment what is the X component of the point , where the spherical coordinates of point are (100,30,60)?
Where did you get that $100 \sin(30) \cos(60) = 26.684892$, should not it be $25$ (if they are in degrees) or $94.1$ (if they are in radians)?
Feb
20
comment Data Representation Question
@JohnHabert :-) nothing like imagination and creativity when sorting through weird question formulations :-)
Feb
20
comment Data Representation Question
@JohnHabert must be a typo of some sort...
Feb
20
comment Data Representation Question
@JohnHabert made the edit, thanks for the catch
Feb
20
comment Writing $A(t)=1+S_1S_2^{-1}$ as an Ito diffusion process.
@dae make an edit with your answers. This uses the Ito product rule $$d(XY) = XdY + YdX + \frac{dXdY}{2}$$
Feb
20
comment Tower Property for Conditional expectations
@user130272 I don't understand. What exactly is the question you are trying to solve?
Feb
20
comment Tower Property for Conditional expectations
@user130272 why would you need to? If the only thing you are asking about is whether $\mathbb{E}[Z|Z=z]=z$, this is trivially true for any random variable - you are conditioning it on its own value, it becomes a constant.
Feb
20
comment who invented division and why we do division in those steps told?
Still don't understand, are you asking about operation or notation?
Feb
20
comment who invented division and why we do division in those steps told?
Are you asking who invented the operation of division and why, or are you asking who invented the American notation for long division? Note in Russia, e.g., a different notation for long division is used.
Feb
20
comment Tower Property for Conditional expectations
So what are you asking, how to find $Z$? What are your thoughts? People will give you hints, but please show some effort on the problem.
Feb
18
comment random graph on the reals
I am wondering what the notion of a graph isomorphism applies to random graphs -- you only know the number of vertices, not the edges?
Feb
18
comment Solve linear equation system $A'Ax=A'Bz$
@Manuel what do you mean by alternative technique - alternative to least squares or an alternative to QR decomposition implementation of least squares?
Feb
18
comment calculate the sum of n initial terms of the sequence
No one said life was supposed to always be easy :-). On the other hand, this is a very useful and often needed result. It helps to derive it once and keep in your toolbox forever.
Feb
18
comment Factoring the quintic polynomial $x^5+4x^3+x^2+4=0$
@Surferonthefall you have to factor many pages of those and you develop intuition :-)
Feb
18
comment Showing that a function is constant
+1, very well thought out question. I wish everyone asked questions like that :-)
Feb
18
comment calculate the sum of n initial terms of the sequence
I don't understand, what are you asking for? You already wrote out the first couple of terms, and you have the generic form of an $n$-th term. Do you want to sum the first $n$ terms?
Feb
14
comment non-planar graph question
Hi, what are your thoughts on this homework problem?
Feb
13
comment stats - calculate marginal pdf of $f(x,y)$ - limits of integration?
tried my best to interpret your equation correctly, please verify
Feb
13
comment No theft model of corruption
+1, first time i am seeing an attempt to mathematically model bribery. Awesome!