Recent content by WolfOfTheSteps

I'm still thinking it's high. Let's assume everyone on Earth lays flat on the ground, and that avg height is 1.7m and avg width is .45 meters. So each person is 7.65e-7 km2. This multiplied by 6.96 billion people is 5324 km2. The surface area of the Earth is 510,072,000 km2. So the...

Yeah, this is what I assume they meant. But still, it seems like a very inflated probability.

I saw this in http://www.space.com/12928-falling-satellite-crash-late-september-nasa.html" about the debris from the UARS satellite. This seems like an extremely large probability to me. They do not make any reference on how they computed this. Does anyone here know how they could have come...

If x and y are independent and identically distributed exponential random variables, and z = x+y w = x-y are z and w also independent? Do I have to actually find the joint pdf of z and w, then find the marginals and then see if they multiply to equal the joint pdf? Or is there a way to just...

Thanks, that makes sense. Also, instead of going to L'Hospital's rule, I could just go back to the summation for k=0,+-5, etc and show that it is a summation of ones... while the fraction would prove the "0 otherwise" for the other k values. This would work too. Thanks a lot!

I totally forgot about that factoring trick: 1-e^{-j x} = e^{-j x/2}(e^{j x/2}-e^{-j x/2}) = e^{-j x/2}jsin(x/2) That's all I needed! UPDATE: Wait, I was wrong. :frown: :frown: Even with that factoring trick, I get: e^{-j(\pi k-\pi k/5)}*sin(\pi k)/sin(\pi k/5) But...

This is not really a homework problem, but I'm studying a text, and I came across this: http://img198.imageshack.us/img198/4586/sumh.jpg I know how to get that fraction with the exponents in it (using a summation formula). But for the life of me, I can't figure out how to manipulate that...

Homework Statement A is nxn B is nxp Is the rank of [B AB ... An-1B] equal to the rank of [AB A2B ... AnB]? If not, under what condition will the ranks be equal? The Attempt at a Solution I don't even know where to start. I know that both matrices should have the same...

Yes, my linear algebra is a few years out of service, but it is not non-existent. You have refreshed my memory. Thanks.

How do I write the form of the solution to this equation: \dot{\vec{x}}(t) = \left [ \begin{array}{cc} a_{11}(t) & a_{12}(t) \\ a_{21}(t) & a_{22}(t) \end{array} \right ] \vec{x}(t) I just need to be able to write x1(t) and x2(t) so I can do the rest of the problem I'm...

If I were you, I'd try to just become really good at programming. You don't have to take classes for it, though... If you have a math degree and can prove that you have very strong programming skills, you should have no problem finding a job. Also spend a lot of time practicing brain teasers...

Thanks, Greg. Being told not to freak out is probably exactly what I needed at this point. :smile: I guess I can't go back in time, so I'll just have to do everything in my power to get things done and see what happens. Thanks again.

And if I don't magically find an internship for this summer (which is probably the most likely case), how screwed am I? If I graduate with near a 3.7 or so GPA from a prestigious university and a some independent research projects, but absolutely no internships/jobs, how hard will it be to...

Hello, So, summer started and I don't have an internship or summer job. I graduate in December, and I have not yet had an internship. :( I'm a good student at a top ranking school, with a 3.65 GPA in Electrical Engineering, specializing in communications and signals. (Lot's of upper level...

Go to http://ocw.mit.edu" and go through some of the EE courses. Some even have video lectures. Also, I remember Berkeley had a few good video lecture sets for EE. I forget the url, though.