# macrofire

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May 2013
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1. ## A Challenging Idea

It's not a textbook problem or contest question. I was just developing this idea a bit and decided to throw it out for anyone else to see. I should specify something here. When I say a directed planar graph, I was thinking about a project onto a 2D surface from whatever dimension the original comes from. That aside, I do not know the dependencies of the coefficients of the vectors (do we really want to put them into a coordinate system? technically, vectors can exist without a fixed coordinate system). Of course, the direction of the perspective is important as well. There will be certain way
2. ## A Challenging Idea

I have this idea that is very interesting, but I don't have any time to pursue it at the moment. Enjoy racking your brain! Say I have a vector in 3-D space defined as r1 = a1i + b1j + c1k, where i,j and k are the standard basis in 3D vector space and a,b,c are continuous, differentiable functions with respect to some parameter t. (I'm trying to write R sub 1, a sub 1 etc...) So now let pr be the vector pr1 = pa1i + pb1j + pc1k such that each component of the vector has a probability p of appearing and a probability 1-p of having a value of 0. Now, imagine a set of vectors r1, r2 ...rn such th
3. ## MAY13 Physics HL Paper 3

Relativity and Particle Physics. That one question on quark confinement didn't make much sense...but i guess everything else went well.

5. ## THAT experience which was HL Physics Paper 2 TZ2

A6? huh, the one I did only went up to A5. Did B2 and B4. Didn't sound too bad. B1 and B3 looked pretty scary though. Or parts thereof.
6. ## Physics HL/SL Help

http://physics.stackexchange.com/questions/19813/calculating-gravity-when-taking-into-account-the-change-of-gravitational-force I thought about it for a while, and then I found this. Take a look at some of the stuff and their links to other works on the same topic. If it doesn't make sense, tell me. On another note, can anyone explain the Lie Group SU(3) and how that relates to Quantum Chromodynamics? If you could give a simple analogy, that would be great.
7. ## IA Type II -- Gold Medal Heights

I figured out how to analytically create an equation for a logistic function. That took a while.
8. ## New Years Resolutions! What will you do?

Why Python? It's rarely practical in the professional world. Have you ever heard of SAGEMATH? If not, go check it out. That alone is why I need to learn Python. I'm starting to learn C1999... and it's not that bad. Why are you taking such programming courses? Are you studying pure maths in the future? I don't take programming courses. SAGEMATH is pretty useful in terms of its functionality, and I have to learn Python to take full advantage of it.
9. ## Ban the person above you

Banned because nutella is not sold in Vatican city.
10. ## Corrupt A Wish

Granted, but it's unprofessional (so you didn't grant his wish...good game buddy) I wish.
11. ## Sine division formula

Thanks, although...you made it somewhat more complicated. Really, you gave me 3 identities to work with...I just wanted some really simple identity though...