Semester page for ECON4120 - Spring 2015

The last exponent missed a negative sign, it should be 
¨C (t⁹ ¨C 1) / 27.

Marcus and myself had an improvised meeting with the Department's administrative resources right now.

• You can contact him on the matter, and
• the Department has agreed to forward communication from him, most likely early next week - thus, keep an eye on the inbox of your UiO e-mail (the one that the University uses in formal communication, e.g. "student.*.uio.no" type). 

Edit: his e-mail is marcusbr@student.sv.uio.no

The questions during the exam took more time to answer than usual, and those minutes may certainly have been less efficient.

I will make sure that the grading guidelines include information about the circumstances. The committee will apply their best judgment.

- Nils

Nobody showed up for today's consultation hours, so I doubt there is much demand for the following. Nevertheless, given that next Wednesday I have reserved half the "consultation hour" slot for Mathematics 3 (1215-14 to be more precise), here is a suggestion: I will be available next Tuesday, "lecture time" (1415-16). Open agenda. If enough people will leave me an e-mail that they want to show up, then we can find a room. If only a couple ... then my office is just as convenient.

- Nils

As far as I can see, there is nothing in particular that has been requested for review? Or have I forgotten something?

I will not be as much in office as one could hope - I've got an issue with my back, and have been ordered to spend less time in the chair and more walking. 
If you send an e-mail I can easily be in office by appointment, but the chance of finding me by just knocking my door are somewhat reduced. 

- Nils

I posted my notes for seminar 11, but there is an error (and there may be more; let me know!):

The last expression on page 8 should have bBy^b, not bBy, in the denominator, and aAx^a, not aAx, in the numerator.

Good luck on the exam!

Eivind

This is the one I will cover in the review lecture.

Exam problem sets for next week: Spring 2011 and Spring 2014.

Before you do those, you should likely do a couple of quadratic approximation problems, and maybe also a couple involving homogeneity. 

• For homogeneity: Give a simple argument why a homogeneous f(x ,y) can be written as x^k u(y/x) as long as x>0, where k is the degree of homogeneity.
  (Hint: f(x,xy/x) = ... ?)
• Do Problem 22 part (d), which concerns quadratic approximation.  Parts abc will likely not be given priority.
• Find the quadratic approximation of ln(1+x²) around x = 0. Compare it to the first-order approximation of ln(1+x). Comment?
• Find the quadratic approximation of ln(1+ e^x) around ln 2.

I got an e-mail that there is no specific reference in the schedule. You already know that the Lagrange multipliers do have an interpretation, and I will make that more precise, in the context of the envelope theorem. 

I do not have the books in front of me right now, and when I am back at Blindern you will most likely have looked up those parts by yourselves. So, I will cover:

• the envelope theorem ("omhyllingssetningen" in Norwegian);
• interpretations of the Lagrange multipliers;
• remaining bits and pieces on optimization;
• a few examples
• if I start on homogeneous and homothetic functions tomorrow, we will be very light on it.