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For me it was 10 years ago and I still go back and keep up with math problems just because it is my true love. About 3 years back I was thinking about going for a phd in physics and got as far as taking the physics GRE. I managed to get a 710 out of 1000 on it, but was shooting for an 800, still not bad for someone dusting off the cobwebs.
I can imagine the sinking feeling one would have after ordering my book,
only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon
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Amen. I did my BS and MS in Mathematics. I was never a typical A student since I never cared about being one. I was mostly B's with a few A's. However, some of my friends (who mostly were A students) were thinking about getting their PhDs in Math (back in 1995) and took the Math GRE. I took it with them since I figured what the hell. Aside from a Russian student who nailed it, I was able to get a 910/990 which was the second highest grade of the students that I knew (about 5 out of 10 who took the test). The next highest grade was a 780. When I realized that I had the potential since I was always good at homework and research, I decided it wasn't something I wanted after all. The only reason I didn't nail it was because I hadn't taken abstract algebra which was a big part of the test and the toughest Math class anyone could take, and I hate not guessing even though incorrect answers count against you whereas skipped ones count as zero. If I ever win the lottery, I would probably quit work and go back to school for various degrees, a PhD in Math being one of them.
Mathworld is a great resource for keeping up to date on Math. I also recommend subscribing to the Mathematical Association of America (MAA). 90% of their articles are way above my head, but the other 10% makes it worthwhile. Also, take a look at my Math sig link to see the books I've read. I recommend these as a great way to keep up-to-date on your Math skills.
"I know which side I want to win regardless of how many wrongs they have to commit to achieve it." - Stan Shannon
Web - Blog - RSS - Math - LinkedIn
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Man, 910 is awesome. I took that right out of school and got somewhere in the 720s. I had forgotten most of my integral formulas and stuff like that since I really hadn't had those since high school. I had a hard time keeping focused on class when there was such a great library so close by. I'd have 20 math and physics books checked out all at the same time and spent most of my free time reading up on whatever interested me at the time.
I'm currently going back over 2d hyperbolic geometry as it relates to relativistic velocity space. Going through and building up rotations and translations out of reflections represented in RP2 with a (1,2) metric.
One of the things I puzzled over the first time I saw it in physics was that adding 2 non-colinear relativistic velocities resulted in an object which appeared rotated w.r.t. a stationary observer. Once I looked at it in terms of hyperbolic space I realized it was just another way to state that hyperbolic triangles have total angle < 180 degrees because of the curvature of the space.
If I won the lottery, I'd do exactly the same thing as you.
I can imagine the sinking feeling one would have after ordering my book,
only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon
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I tend to forget anything i don't use frequently. A year ago i was setting up a simple CAD-style view in our app, and needed to work out some transformation formulas. All stuff i'd learned years ago, reading CG P & P and making sense of it while raking hay. It took me a solid week to get it back. 
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Michael Dunn wrote: I got my math degree *mumble* years ago, but I'd be hard-pressed to do a simple integral these days.
I took a D in math, partially because of some college politics at the time... but now I use math even more. I never really took math seriously, I honestly believed at the time that I would never use my math again, so resented having to take it all. So part of it was my attitude too. I was a B student in any other college, because of my attitude I just couldn't manage to get the 92% required to pass Calc I with a C during that particular year. So I left the college (and the college got in trouble the following year for their practices at the time).
Now my curse is I get to use everything I always said I would never use, daily. Physics, integration, differential equations, quadratics, etc. I brought quaternions to where I work and got them accepted as a standard, now I am reviewing other applications for quaternion and octonian and other hypernumber/Cayley math operations.
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
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I had an argument with my A-Level Maths teacher at school. He insisted that we be able to deduce the equation of a trajectory from first principles, whereas I pointed out that it was easier to just remember it. He said I'd never be able to remember it, so I bet him £10 I could.
The exam came round, and they gave you the damned formula in the question. My teacher just stood behind me laughing for most of the exam.
I still can't forget it, even though I have no need to know it any more whatsoever.
y=xTanθ-(gx^2/2u^2)sec^2θ, for those who wanted to know....
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Since my engineering degree was awarded 26 years ago, and even when employed as one I rarely needed more than fundamental calculus, I've forgotten most of it. But when I do happen to need it, I know where to look - I kept my books.
"...a photo album is like Life, but flat and stuck to pages." - Shog9
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I retook Calculus I last spring for a refresher so I suppose I am pretty up and running.
A man said to the universe:
"Sir I exist!"
"However," replied the Universe, "The fact has not created in me A sense of obligation."
-- Stephen Crane
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hello frnds!! actually m a new comer to matlab and i need th ecode for kruskal algo in matlab .it shud be dynamic type(if possible, else graph specific). by dynamic i mean dat the user will enter the no of nodes and edges and the corresponding weight and then d graph will be generated and also the mst
plz do reply me at
er.martand@gmail.com
martand shardul
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Well, there comes a good book into my mind: Cormen / Leiserson - Introducing to Algorithms[^]. There you should find minimum spanning tree and many other important algorithms. It's easy to read and if you don't know something it's a good resource.
Regards,
Ingo
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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How to speak english properly[^]
they forgot :
- no sms type.
- plain words ortograph...
also, being on a forum, no, we won't answer you on your email (we even should blame you for this, but ok, it was your first post here). do you know the purpose of a forum ?? it's about to share knowledges... answering you on your email is at the antipods of this goal.
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1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321
1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111
1234 x 9 + 5 = 11111
12345 x 9 + 6 = 111111
123456 x 9 + 7 = 1111111
1234567 x 9 + 8 = 11111111
12345678 x 9 + 9 = 111111111
123456789 x 9 +10= 1111111111
9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888
9876 x 9 + 4 = 88888
98765 x 9 + 3 = 888888
987654 x 9 + 2 = 8888888
9876543 x 9 + 1 = 88888888
98765432 x 9 + 0 = 888888888
And finally, take a look at this symmetry:
1 x 1 = 1
11 x 11 = 121
111 x 111 = 12321
1111 x 1111 = 1234321
11111 x 11111 = 123454321
111111 x 111111 = 12345654321
1111111 x 1111111 = 1234567654321
11111111 x 11111111 = 123456787654321
111111111 x 111111111 = 12345678987654321
Bombing for Peace is like F***ing For Virginity"
My Articles
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That's interesting... I'm just wondering if I can apply it to anything useful. Probably not, but still a fun exercise.
(Nice sig, BTW).
- S
50 cups of coffee and you know it's on!
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Steve Echols wrote: (Nice sig, BTW).
Thanks  That was from a T-Shirt.
Bombing for Peace is like F***ing For Virginity"
My Articles
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The version I know is "fighting" but I guess "bombing" is more relative nowadays.
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a(n) = (n + a(n - 1)*10^L(n)/(1 + 10^(n*L(n - 1) - (10^L(n - 1) - 1)/9)))*(1 + 10^((n + 1)*L(n) - (10^L(n) - 1)/9))
where L(n) = floor[log10(10n)]
11, 1212, 123123, 12341234, 1234512345, 123456123456, 12345671234567, 1234567812345678, 123456789123456789, 1234567891012345678910, 12345678910111234567891011, 123456789101112123456789101112, ...
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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Interesting. Does it carry over into number systems with bases different than 10?
The evolution of the human genome is too important to be left to chance.
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I'm almost done reading Hilbert's Tenth Problem, by Yuri V. Matiyasevich © 1996. This book is way advanced for me, but there are some interesting bits that can be found here[^].
"People who want to share their religious views with you almost never want you to share yours with them." - Anonymous
Web - Blog - RSS - Math - LinkedIn
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Well, it's not long ago, I thought about drawing a twenty sided dice (Ikosaeder on German, I don't find the English expression) with OpenGL on my own. It's easy to draw a four, six or ten sided dice, I know the formulas behind them.
But what about a twenty sided one? Of course I could sit down and figure it out on my own, but perhaps anybody knows a good source on internet where to find formulas for such geometric objects?
Regards,
Ingo
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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ihoecken wrote: Well, it's not long ago, I thought about drawing a twenty sided dice (Ikosaeder on German, I don't find the English expression) with OpenGL on my own.
I'm pretty sure you'r looking for a Icosahedron, which is a 20-sided sphere, not dice.
Anyway, this example is in delphi, but the OGL commands should be easy enough to understand...
http://www.sulaco.co.za/drawing_icosahedron_tutorial.htm[^]
Jeremy Falcon
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Jeremy Falcon wrote: I'm pretty sure you'r looking for a Icosahedron
Right.
Jeremy Falcon wrote: which is a 20-sided sphere, not dice
Well it's called dice, too: Non-cubical dice [^] but it doesn't matter, thank you for that source.
Regards,
Ingo
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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ihoecken wrote: Well it's called dice, too: Non-cubical dice [^]
 Well, I'll be. I'm learning myself, so work with me here.
ihoecken wrote: thank you for that source.
No problem.
Jeremy Falcon
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Ok, I just read that link. I think they are referring to it as a die (dice) because of it's use, not it's shape - which is still a sphere.
The distinction is important because searching for the right term will help you find the results you want - which is what I did for that link.
Jeremy Falcon
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Jeremy Falcon wrote: Ok, I just read that link. I think they are referring to it as a die (dice) because of it's use, not it's shape - which is still a sphere.
Sorry, you might be right. That's a translation problem. In German a sphere just mean a "ball" without edges, for us it's a "Polyeder" or dice (Würfel). So I learned something about English language, too.
Regards,
Ingo
------------------------------
PROST Roleplaying Game
War doesn't determine who's right. War determines who's left.
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