[Calculus] Product rule problem I can't figure out..

fjekaodl · 2012-05-26T04:03:01.999706+00:00

It's not that it's easier, but that the chain rule tells you to multiple everything by 1 in this specific case. So nothing changes in your answer.

But the thought process, which is the only important thing when doing homework, is going to be messed up. I would suggest that once you learn the chain rule to come back to this problem.

EDIT: To make it more clear (to future you :D), find the derivative of f(x) = 3x(2x-1)⁶

fjekaodl · 2012-05-26T03:49:11.385293+00:00

Out of curiosity, have you not learned the chain rule yet? Asking you to solve this problem before learning chain rule is going to confuse the shit out of you later :/

infrikinfix · 9 days

My game theory professor (this was offered in the math dept) used ! to denote unique. Had never seen that before in any math class, and I've had to prove a lot of different things are unique over the years. It took me a while to figure out what it meant as he seemed to assume this was normal. Perhaps it is?

SantyClause · 10 days

Damn!

pv77uck3r · 10 days

If it is coming down to a choice between econometrics and labor, take econometrics. It really does not matter what UG field classes you take. Also take at least a probability course from the math department. Statistics as well if you can manage it. Modern algebra (this is abstract algebra right?) is useless as far as econ is concerned, but doing well in it can be a very good signal since its proof based.

Here's a very good forum you can use for more information. Helped me a whole lot. You can ask questions and compare your profile to others.

In particular, I would ask them about your GRE. 780 is sorta right at the (already somewhat arbitrary) cutoff.

http://www.urch.com/forums/phd-economics/

pv77uck3r · 10 days

I got into a top 15 for Fall 2012.

GRE math needs to be 780 or better for a shot at the top 25. You merely have to have this to be considered, it will not get you in alone. Analytical may matter on the margin. Verbal does not matter.

Math grades and classes are probably the next most important thing. Overall GPA isn't as important as grades in the math (and econ) classes. You need: calc III, diff eq, linear algebra, probability, statistics, real analysis. I was also a math major outright, so I also had discrete I and II, abstract algebra, and they saw that I was planning to take game theory from the math department in my last semester. That probably helped me get in. FWIW, I had a B in calc I (they probably ignored that) and an A- in discrete I and abstract algebra. Everything else A. It is important to note that real analysis is probably the most important math class to do well in.

Econ classes, oddly enough, really don't matter all that much. Just take the usual classes and make sure to have econometrics under your belt.

After that are probably letters of recommendation. Good letters dont come from doing well in someones class. They come from doing research under them. I did a theoretical game theory paper under an adviser, and also was a research assistant of his (menial work, but it will get you a letter).

Overall, I dont think you can say "the most important thing is X, next most important Y" and so on. Technically GRE could be said to be the most important, but it merely gets you looked at. My general impression is that GRE will get you past the first cut, grades will get you past the second cut, and then letters and research experience will be what edge you out above the others. Having exceptional math grades and classes, as in my case, would also help in the last cut.

EDIT: Also, what undergrad you are coming from is very important. Mine was not all that great and was probably why 7 of 9 schools rejected me, and one of them wouldn't even fund me. I got very lucky getting into a program that was perfect for me. If your undergrad is good (top liberal arts, or top 40 econ/math) then apply to about 10 schools. If you are like me and coming from an unknown school or econ/math department, then apply to 15 or so.

GuyWithGirlName · 10 days

e shouldn't be introduced in high school because it seems completely random. Why is 2.71... somehow meaningful? Once you get to calculus (and especially diff eq) the reason makes more sense.

GuyWithGirlName · 10 days

I was in the same situation but I didn't find it all that bad. Putting a system into a matrix should be intuitive, and then eigenvalues are just a "magic box" you use until you learn what they actually are in linear algebra.

SwampJew · 21 days

Yep! Finished it around January.

SwampJew · 24 days

If you have a lot of mathematical competence (up to real analysis), Owen's book is quite good and covers many areas: http://www.amazon.com/Game-Theory-Guillermo-Owen/dp/0125311516/ref=sr_1_1?ie=UTF8&qid=1335933200&sr=8-1

If you are interested in economic applications and dont have quite that much mathematical competence, Gibbons book "game theory for applied economists" is good.

Ultimately, I think game theory is only going to be worthwhile studying if you are quite good at math. You can learn very basic games and ideas without it, but to really appreciate it requires math.

sg187 · 1 month

I'm taking a course where this was a question: Its number 7 here: http://faculty.tcu.edu/ggilbert/60603/HW-Exams/60603HW1.pdf

And solution: http://faculty.tcu.edu/ggilbert/60603/HW-Exams/60603HW1Sols.pdf

I think the guy who first came up with it literally stumbled upon it, and then proved it.

SantyClause · 1 month

Haha, I just hate physics. The math is obviously easy I just dont really get any of the relationships. I'm a econ/math guy. Science is great and all, I just have accepted the fact that I will never understand it.

SantyClause · 1 month

Thinking: Since S is compact, we could setup a lagrangian. the constraint g(x,y) is the boundary. So if f(x,y)=x^s * y , we have gradiant f = lambda gradiant g...and since g is compact we know its maximum is achieved so that we can actually solve the lagrangian

SantyClause · 1 month

Well even if I know its continuous--which I need to prove--the extreme value theorem would state that it achieves a maximum but that doesn't say anything about its uniqueness.

SantyClause · 1 month

It would be fine to say (u,v) = (x,y) and just be in the x,y plane.

matthewlmcclure · 1 month

I would have been awful at proofs if we had not covered basic logic in my discrete mathematics class. Knowing precisely why direct/indirect/contrapositive/contradiction proofs actually work makes using them much easier.

AntiAggressiveForce · 1 month

A lot of where a bargaining process ends up depends on where it starts.

EDIT: If you can more clearly define a game with strategies and payoffs for this, we could figure out what should be happening more effectively. I dont know enough about the justice system to begin defining a game.

MaoThatHurt · 1 month

If I'm understanding your question correctly...

The first number in a cell typically refers to the "row" player, and the second number to the "column" player. These two numbers should be separated by a comma.

spoiled_baby · 1 month

3% inflation is a good target as it alleviates unemployment without causing distortion of price signals to any significant degree. If you're at 0%, not only does this not help unemployment but you are terribly close to deflation which can spiral out of control (see: great depression). Currently I think inflation is somewhere around 1.5%-2%, which is a bit low. We are in absolutely no threat of reaching 1970's style inflation. In fact, we were quite afraid of the deflation scenario.

spoiled_baby · 1 month

It really shouldn't.

SantyClause

TROPHY CASE

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