Search found 30 matches

by marginally_stable
Tue May 31, 2011 2:24 am UTC
Forum: Mathematics
Topic: An inspiring mathematician
Replies: 20
Views: 3907

Re: An inspiring mathematician

Persi Diaconis at Stanford. His is a remarkable story, and he has written some expository articles about math and life. Check him out.
by marginally_stable
Tue May 31, 2011 2:08 am UTC
Forum: Mathematics
Topic: Getting my undergrad in math. How about you?
Replies: 51
Views: 8185

Re: Getting my undergrad in math. How about you?

Age 27,
PhD. in mechanics (applied dynamical systems), MS in applied math, BS in mechanical engineering.
Working in a private research lab.
by marginally_stable
Sat Jan 17, 2009 12:12 am UTC
Forum: Mathematics
Topic: What's your favorite branch of math, and why?
Replies: 15
Views: 2693

Re: What's your favorite branch of math, and why?

I love and work in Dynamical systems. It is a subject which allows you to combine analysis(e.g. ODEs, functional analysus) and geometry (topology,differential geometry) in a unique way. Put some random processes (Probability) in it, and you have got stochastic dynamical systems, which is a area brim...
by marginally_stable
Sat Oct 04, 2008 10:51 pm UTC
Forum: News & Articles
Topic: Google - Rocking like it's 2k1~
Replies: 59
Views: 6089

Re: Google - Rocking like it's 2k1~

September 11 WTC attacks.
"9/11 attacks" gets 0 in this 2001 search.
And gets 3 million hits now.
by marginally_stable
Fri Aug 01, 2008 4:02 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0457: "Frustration"
Replies: 195
Views: 37787

Re: "Frustration" Discussion

:D :D :D . Best one in a long long time.
by marginally_stable
Tue Jul 29, 2008 4:07 pm UTC
Forum: Mathematics
Topic: most important languages for maths
Replies: 10
Views: 1971

Re: most important languages for maths

I don't know any of those languages, but during my grad studies so far, I have come across some German papers and thesis, but I was able to find a English translation. But then I am in applied math.
by marginally_stable
Sat Jul 26, 2008 11:25 pm UTC
Forum: News & Articles
Topic: Wisconsin man arrested for shooting lawnmower
Replies: 9
Views: 1784

Re: Wisconsin man arrested for shooting lawnmower

"Anything not factory recommended would void the warranty"
Lol! :D
by marginally_stable
Sat Jun 21, 2008 1:40 am UTC
Forum: Mathematics
Topic: Math(s)-Based Anger
Replies: 20
Views: 2374

Re: Math(s)-Based Anger

I have had many such instances in my life with huge losses. In India, to get into the elite engineering colleges(the 7 IITs), there is a 3 subjects(math,Physics,Chem) test 2 hour each, on the same day, in the summer after you graduate from High school. And usually, it goes as Math->Physics->Chem fro...
by marginally_stable
Sat Jun 21, 2008 1:13 am UTC
Forum: Mathematics
Topic: proving the "bac cab rule"
Replies: 13
Views: 7385

Re: proving the "bac cab rule"

Umm.the formula looks wrong.
by marginally_stable
Thu Jun 19, 2008 6:19 am UTC
Forum: Mathematics
Topic: Steady State Solutions?
Replies: 18
Views: 2445

Re: Steady State Solutions?

Is it just subjective or is there something special which makes sin(t) become the steady state? If memory serves me correctly, it's the steady state solution because the exponential dies out as 't' tends to infinity. The function is then in a steady state of simple harmonic motion, whereas it start...
by marginally_stable
Thu Jun 12, 2008 12:33 am UTC
Forum: Serious Business
Topic: Tripling your IQ, yes or no?
Replies: 145
Views: 14611

Re: Tripling your IQ, yes or no?

On a more pedantic note, if everybody undergoes the surgery, their "IQ" number remains same, since it is normalized over the whole populations. But carry on.
by marginally_stable
Wed Jun 11, 2008 11:58 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0435: "Purity"
Replies: 649
Views: 194859

Re: "Purity" Discussion

I wonder how replacing "pure" by "poor" will change the picture. Haha!
by marginally_stable
Wed Jun 11, 2008 10:46 pm UTC
Forum: Mathematics
Topic: Chaotic Systems
Replies: 13
Views: 1784

Re: Chaotic Systems

Actually, sensitive dependence on initial conditions isn't even a requirement for a system to be chaotic; it's a property that follows from a system being chaotic (if a system is chaotic, then it has sensitivity to initial conditions). The only two requirements for chaos are that the set of periodi...
by marginally_stable
Wed Jun 11, 2008 10:21 pm UTC
Forum: Mathematics
Topic: Analysis Textbooks: Rudin vs. Buck
Replies: 11
Views: 2719

Re: Analysis Textbooks: Rudin vs. Buck

Unfortunately first year analysis is not something you can actually teach yourself. I say pick up Rudin, go to class everyday, pay attention, and work on some supplementary materials online while you can. One thing great about Rudin is that since it's so popular, there are many many solutions of it...
by marginally_stable
Wed Jun 11, 2008 4:36 am UTC
Forum: Mathematics
Topic: Analysis Textbooks: Rudin vs. Buck
Replies: 11
Views: 2719

Re: Analysis Textbooks: Rudin vs. Buck

I would be suspicious of anyone NOT using baby Rudin. Rudin+better Professor=FTW.(although, early morning=FTL..:-P)
by marginally_stable
Tue Jun 10, 2008 11:28 pm UTC
Forum: Science
Topic: Favorite Scientist?
Replies: 84
Views: 9214

Re: Favorite Scientist?

Poincare.
by marginally_stable
Tue Jun 10, 2008 10:32 pm UTC
Forum: Mathematics
Topic: Discretization (Linear Algebra)
Replies: 4
Views: 1681

Re: Discretization (Linear Algebra)

Without going through the details, all I can tell you is that eigenvalues need to be negative for a continuous system to be stable and they need to have absolute value less than one for a discrete system to be stable. So if you transform from one to other (and the stability/unstability is preserved)...
by marginally_stable
Tue Jun 10, 2008 10:10 pm UTC
Forum: Mathematics
Topic: Chaotic Systems
Replies: 13
Views: 1784

Re: Chaotic Systems

"Deterministic Chaos" is a mathematical term, which states that if a given system of equations is chaotic in that sense, then two trajectories starting with very similar initial conditions will diverge exponentially with time. That's not what sensitive dependence on initial conditions is....
by marginally_stable
Tue Jun 10, 2008 8:36 pm UTC
Forum: Mathematics
Topic: Chaotic Systems
Replies: 13
Views: 1784

Re: Chaotic Systems

"Deterministic Chaos" is a mathematical term, which states that if a given system of equations is chaotic in that sense, then two trajectories starting with very similar initial conditions will diverge exponentially with time. So basically, given enough time, no matter how close the initia...
by marginally_stable
Tue Jun 10, 2008 4:54 pm UTC
Forum: Mathematics
Topic: Orbit Stability
Replies: 26
Views: 2983

Re: Orbit Stability

What OP is thinking about is the restricted three body problem. Restricted because the third particle is negligible mass w.r.t the 2 original masses. This is the problem that led to development of chaos theory and most of modern dynamical systems theory. Poincare thought of it first while trying to ...
by marginally_stable
Sat Jun 07, 2008 5:45 am UTC
Forum: Mathematics
Topic: Qualified for grad school?
Replies: 4
Views: 1343

Re: Qualified for grad school?

Just make sure you take the right mix of courses (as in algebra,analysis,applied stuff,geometry/topology). Also, the math GRE is looked at in lots of good universities. Good luck.
by marginally_stable
Fri May 02, 2008 1:56 am UTC
Forum: Mathematics
Topic: Show us your articles! Or what's your Erdos number?
Replies: 187
Views: 272917

Re: Show us your articles! Or what's your Erdos number?

Not a pure math paper (more of math applied to trajectory planning), but I was bored and wanted to procrastinate from preparing for a math exam.
by marginally_stable
Fri Mar 21, 2008 6:03 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0399: "Travelling Salesman Problem"
Replies: 115
Views: 28550

Re: "Travelling Salesman Problem" Discussion

Kalos wrote:Big O notation, because despite having 26 english letters, 24 greek letters, and the ability to make up symbols, we STILL choose the one letter easiest confused with a zero


I believe 'O' (or 'o') stands for 'order of ', as in O(n) is of the order of n and so on.
Kthxbye :P
by marginally_stable
Mon Mar 17, 2008 12:31 am UTC
Forum: Serious Business
Topic: No sane and rational person
Replies: 88
Views: 8325

Re: No sane and rational person

I really wouldn't mind getting a job developing some newfangled piece of technology to go into a bajillion-dollar aircraft. It's something I would have a lot of pride in. You mean some people go into military and do research? I thought all it involved was operating the high tech stuff and not actua...
by marginally_stable
Mon Mar 17, 2008 12:13 am UTC
Forum: Serious Business
Topic: No sane and rational person
Replies: 88
Views: 8325

Re: No sane and rational person

I really wouldn't mind getting a job developing some newfangled piece of technology to go into a bajillion-dollar aircraft. It's something I would have a lot of pride in. You mean some people go into military and do research? I thought all it involved was operating the high tech stuff and not actua...
by marginally_stable
Mon Mar 10, 2008 1:23 am UTC
Forum: Serious Business
Topic: U.S. Army
Replies: 55
Views: 6007

Re: U.S. Army

Being a willing pawn-- that means foregoing liberty, something pretty valuable to other people-- for the sake of an institution with the history of defending our people is not something I would be ashamed of. Remember, not all functions of the army have to deal with Iraq or such publicly disapprove...
by marginally_stable
Mon Mar 10, 2008 12:49 am UTC
Forum: Serious Business
Topic: U.S. Army
Replies: 55
Views: 6007

Re: U.S. Army

But I still kind of feel that way. Too many years of playing cops and robbers as a child, I guess. I still want to get the "bad guys". Which is why it's on the list. Deal with it. Are you sure the people you'll be called upon to kill are the "bad guys"? From what I hear, it's no...
by marginally_stable
Sun Mar 09, 2008 11:05 pm UTC
Forum: Serious Business
Topic: U.S. Army
Replies: 55
Views: 6007

Re: U.S. Army

But I still kind of feel that way. Too many years of playing cops and robbers as a child, I guess. I still want to get the "bad guys". Which is why it's on the list. Deal with it. Are you sure the people you'll be called upon to kill are the "bad guys"? From what I hear, it's no...
by marginally_stable
Mon Feb 25, 2008 5:11 am UTC
Forum: General
Topic: Who the dickens are you?
Replies: 10922
Views: 2348552

Re: INTRO THREAD THE THIRD

Hey there, m/24/virginia here. PhD. student in mechanics/dynamical systems.lurker since 2006.

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