Being a weblog devoted to a variety of topics. Including Mathematics. And Mathematical Finance. Sometimes with homework.

Saturday, February 25, 2012

21-270: Week #7

The reading and homework assignments for Week #7 have been posted. You can follow the link from the Schedule page.

Thursday, February 23, 2012

21-260: Exam #1

I returned Exam #1 during class yesterday. If you didn't get yours, you can pick it up from your TA during recitation today. The grade cutoffs for the exam are - A:85, B:75, C:65, D:50. These cutoffs are important for two reasons. First, it gives you an idea where you stand, and second, I use them to compute grade cutoffs for your cumulative averages.

Since the grade cutoffs for this exam are the same as for the homework assignments, the grade cutoffs for cumulative averages are the same, too - A:85, B:75, C:65, D:50. I compute the grade cutoffs for cumulative averages by averaging the grade cutoffs the same way I average your grades (i.e. the A cutoff for cumulative averages is the average of the A cutoffs for each assignment).

An important point to note is that, when computing your averages, the difference between, say, an 84 and 85 is only a 1% difference, not a whole letter-grade difference.

I will make your exam grades and cumulative averages available on the blackboard site.

Thursday, February 9, 2012

21-260: EXCEL groups

My name is Sharanya Venkat and I will be your EXCEL Leader for
Differential Equations this year. EXCEL is a collaborative learning
program through Academic Development that focuses on providing extra
practice to students in groups of 5-6 people especially in Math and
Science courses. We will be going over key course concepts and doing
practice problems based on what you cover in lecture and your

EXCEL groups meet once a week for one hour, at a time that fits in
with your availability. Requests to join a study group can be made
through the Academic Development Office in Suite B5, Cyert Hall.

I hope to see you soon and good luck with the course!

Wednesday, February 8, 2012

21-260: Exam #1 Review

I've posted a review page for Exam #1. You can follow the link from the Schedule page.

Tuesday, February 7, 2012

Academic Development Workshop.

It's kind of short notice, but here is an announcement from Academic Development:

It's a new semester, are you ...

Facing new challenges and opportunities?
Worried that you’ll fall into the same habits that hurt you last semester?
Determined to have a more successful spring term?

If any of these apply to you then you could benefit from registering for one of the following dates of the "Getting Off on the Right Foot Workshop":

Tuesday, Feb. 7
Cyert B6-A

Register now...

Monday, February 6, 2012

21-260: Changes to Office Hours

I wanted to let you know about some updates to the schedule of office hours. Zhe Cheng has changed his hours to Tuesdays 2:30-4:30pm, Thursdays 3:30-4:30pm. Jacob Davis has moved his Tuesday office hour to Wednesday 7:00-8:00pm; his Thursday hours remain the same at 6:00-8:00pm.

I announced that my office hours would be Tuesday from 3:15-5:15pm, except on the first Tuesday of each month when a conflict would force me to move them later, to 6:30-8:00pm. This week only, as a result of another conflict, I'll have to move my office hours to Thursday, 2:00-4:00. Sorry for the confusion.

Friday, February 3, 2012

21-260: Week #4

The reading and homework assignments for Week #4 have been posted. You can follow the link from the Schedule page.

For this week's assignment, you may wish to use dfield to produce some of the slope fields (direction fields). If you are familiar with some other program for doing this, you may use that instead. (I know Maple has a facility for producing these diagrams.)