# CSE 20 Discrete Mathematics

## Welcome to CSE 20!

If you have any questions, comments, things that you want to discuss, don't hesitate to contact us. Come to see one of us during office hours, or send eMail to Christophe.

Martin

#### Changes in the grading policy

As the scores for the quizzes #2 and #3 are lost due to disk failure, those quizzes are counted as 100 points for everybody. No other changes are made. You can still drop your lowest quiz score, as desribed in the general information section.

There are some good reasons for the procedure that we followed.  The only complaints that we have heard have been from those who did well on the quizzes, so this addresses their concerns.  Of course, similar arguments apply to everyone.
1. Asking people to bring in their quizes so we can record the grades again is really encouraging them to cheat; we have already seen some instances of this; of course, that will hurt those who did well.
2. It would make very little difference for those who did well, because almost everyone did well.  The average on the third quiz was almost 80 and on the second was in the mid 90s.  I've calculated this out and in terms of the total points in the class, it could not make more than about a 1% difference, and most likely it would be less.
3. It will be a lot of hassle, both for you and for us, with some chance of other things going wrong in the middle of a complex process.
(The quiz/midterm grade will consist to 40% of the score on the midterms, and to 60% of the score on the quizzes. )

## Notes and Announcements

• Office hours during final's week:
Almira Karabeg - Wednesday 2-3pm, Thursday 10-11am
Beate/Martin - Thursday 9-11am AP&M 5402

• typo corrected in HW8 10.1#30, R intersection S is R, not S.
• Another typo corrected in HW8 the system in 10.1#32: there was a linebreak missing between the 4 and the x in the system (!) of equations, which reads now:

•     x^2 + y^2 = 4
x = y

Last Updated: May 28, 1998