Recent content by Prometheos

Awesome! Thank you so much Shoehorn, that worked like a charm. I thought I had fought through all the "hard" stuff in writing my program until I ran into this concatenation problem.

I have a program that calculates the inverse of a matrix. However, in my for loop I generate n vectors y which are nx1 vectors. The vectors are correctly calculated, but I can't figure out how to concatenate them into an nxn matrix. The problem I think I'm having is that my vector y is...

So by putting sqrt(2) and sqrt(3) adjoined to the field, then it has to have multiplicative closure so sqrt(6) has to be there... so simple now that I think about it. Thanks!

I am having no luck understanding how to find the basis of a field adjoined with an element. For example Q(sqrt(2)+sqrt(3)) I know that if i take a=sqrt(2)+sqrt(3) that i can find a polynomial (1/4)x^4 - (5/2)x^2 + 1/4 that when evaluated at a is equal to zero. So, from that I know the...

Disregard, figured it out.

1. Prove that (Q,+) is not cyclic Here is what I have, and I need help knowing if this proof makes sense, is thorough enough, or is completely wrong. Note that (Q,+) is rationals Suppose, by contradiction, that (Q,+) is cyclic, p/q E (Q,+) and q=/=0 => (Q,+) can be generated by <p/q>...

Ah, so you get \frac{1}{4}e^ {2x} + \frac{1}{2} + \frac{1}{4}e^{-2x} after distributing the .25 and adding the one which is equal to \frac{1}{4} ( e^{x} + e^{-x} )^2 Wow, high school algebra comes back to haunt me again. Thanks for the help, I may have missed this problem on the...

This question was on my test I have no idea how to do the middle work. Find the length of the curve y = \frac{1}{2}(e^x + e^{-x}) , 0 \leq x \leq 2 Problem set up was easy enough L= \int_0^2 \sqrt{ 1 + \frac{1}{4}( e^{2x} -2 + e^{-2x} ) } dx Looking back in my notes I see that the...

Ok finally got it, thanks to you. I set a1t1 = a2t2 => t2 = a1t1 / a2 x_{f1} = 0 + 0 + .5(.1)t_{1}^2 1000 = .5(.1)t_{1}^2 + .1t_{1}t_{2} - .5(.44)t_{2}^2 So the term I was missing was the .1t_{1}t_{2} Substitution blah blah t1 = 127.72 t2 = 28.99 Thanks for the help hopefully I get...

as far as where I derived them from I just took the integral of velocity. I know the accelerations and I know they are over two different time intervals. And, I know the total distance is 1000m so from vf = vo + at I got 1000 = .5at^2 But, that is the limit of my knowledge on this problem. It...

Ok, I had a response typed and in doing so I got it, finally my brain clicked. T was the total time or t2 (stan's), the question wanted the time it took kathy to overtake stan => t1=5.81 -1 = 4.81. I guess after hours of staring at one problem you start to miss the obvious. On Problem one I...

Looking back at my notes I actually have \frac{1}{2} 5.4t_{1}^2 = \frac{1}{2} 3.7t_{2}^2 So that is my fault on converting it to latex. And, I think that is what you were suggesting in fixing my time relationship, it should be right now. But, the answer is still wrong =/

Problem 1 A commuter train travels between two downtown stations. Because the stations are only 1.00 km apart, the train never reaches its maximum possible cruising speed. During rush hour the engineer minimizes the travel interval Δt between the two stations by accelerating for a time interval...