Introduction to Differential Equations

**6/5/11**The Math 20D final examination will be held from**3:00pm to 6:00pm**on**Friday, June 10**. Please bring your student ID with you to the exam: we will check it against the roster. Extra office hours are being offered in the week before the final. They are:- Tuesday 11am-1pm Prof. Minnes
- Wednesday 10am-12pm Michael Kasa
- Wednesday 1pm-2pm Prof. Minnes
- Wednesday 3:30pm-4:30pm Monty Taylor
- Thursday 10am-12pm David Zhang

**4/27/11**The average on the second exam was 35 out of 50. The standard deviation was 10.**5/31/11**The course homework page has been updated with respect to Homework 7.**5/18/11**The course homework page has been updated with the correct due date for Homework 6: May 27.**5/4/11**The course calendar page and homework page have been updated. We will omit Section 7.8 so that the other sections won't be rushed.**4/28/11**The course homework page has been updated. Section 7.4 will be collected with Homework 5 on May 13.**4/27/11**The average on the first exam was 40.5 out of 50. The standard deviation was 5.**4/11/11**The following supplement on complex numbers and exponentials might be useful. I particularly recommend reading it before doing the homework for Chapter 3.**4/11/11**Selected solutions for homework problems are now available at the password-protected page www.math.ucsd.edu/~rmrodrig/math20d. The username and password have been sent to your UCSD email account.**4/5/11**The course homework page has been updated. Section 2.5 will be collected with Homework 2 on April 15.**4/5/11**Below is some information you might find useful about the MATLAB portion of the course:- The ACMS computer lab where MATLAB Tutors will be officially stationed in is:
AP&M B432 Windows PC Lab (40 computers).
If AP&M B432 becomes full, students may also use the computers in the
2 neighboring ACMS labs across the hall from AP&M B432:
- AP&M B349 Windows PC Lab (28 computers)
- AP&M B325 Windows/Linux Lab (22 computers - default boot to Windows)

- Sun - Thu 7:00 am - 10:00 pm NO DOOR CODE REQUIRED
- Fri - Sat 7:00 am - 5:00 pm NO DOOR CODE REQUIRED

- The schedule of when MATLAB Tutors will be present in the MATLAB Tutor Lab in AP&M B432 for this quarter is located at: http://www.math.ucsd.edu/announcements/room_scheduling/?room=B432
- Students who wish to print out their assignments using a lab laser printer need to FIRST setup a "Laser Printing Account" with ACMS BEFORE attempting to print to a lab laser printer (or it will not work!). Printing to a lab laser printer costs 5 cents ($0.05) per page. To setup a laser printing account, sign up online at http://sdacs.ucsd.edu/~icc/laser.php and pre-deposit a specific non-refundable dollar amount that will be charged in advance to your UCSD Student Business Services billing account.
- To login to an ACMS lab Windows PC computer, students must use their
OWN UCSD ACMS ACCOUNT NAME and ACMS PASSWORD to login.
If the student does not know their own UCSD ACMS account name or has
forgotten their ACMS password:
- Go to "http://acms.ucsd.edu/".
- Click on the "Account Lookup" link (on the left sidebar "Tools").
- Follow the instructions for the "If you do not know your account name:" section. This webpage will then tell the student what their ACMS account username is and allow them to reset their ACMS password. Please note that any password changes or resets can take up to ONE FULL HOUR MINIMUM to go into full effect.

Please remember that if you want to save any files you create on a lab computer to always only put them INSIDE the "My Documents" folder (AKA as the "H:/" network drive) OR in the additional "ma20dxx"/"ma20fxx" class-specific account storage space that is available under the "Class Resources" folder on you desktop area. IMPORTANT: Do not leave files behind on the Windows "desktop area". The desktop area is part of the "user profile" which is stored separately and may be subject to reset by ACMS (all such files will be LOST AND UNRECOVERABLE!). - LOGIN PROCEDURES FOR WINDOWS PC LABS:
- LOGIN: Logging into the local Windows PC computer:
- Press Control-Alt-Delete on the keyboard to bring up the login window.
- Fill in the fields like this:

User name: (Enter student's UCSD username -- e.g. "jdoe")

Password: (Enter student's password - up to the first 8 characters ONLY)

- Then click on the white right-arrow button (or hit "Enter" on the keyboard) to login. If successful, the Windows desktop should appear.

- Launch the applications needed for the lab assignments:
- Go to Start menu -> All Programs -> Internet Explorer (OR Mozilla Firefox -> Mozilla Firefox)
- Go to Start menu -> All Programs -> Microsoft Office -> Microsoft Office Word 2010
- Go to Start menu -> MATLAB -> R2010a -> MATLAB R2010a

- Proceed with MATLAB assignment. Go to http://www.math.ucsd.edu/ -> Course Web Sites -> MATH 20D/20F
- LOGOFF: Properly logging off the computer when done
REMEMBER to
- Save any work, close all the open windows, and quit any still-running programs.
- Go to the Start menu -> Log Off

- LOGIN: Logging into the local Windows PC computer:
**3/25/11**The publisher has made available "binder-ready" versions of the textbook at a reduced price. More information is at http://www.wileybookstore.com/UCSD/ if you are interested.**3/10/11**Welcome to Math 20D!

### Academic Links

- Course Syllabus
**Updated 4/5/11**You are responsible for knowing the information and policies in the syllabus. - Course Calendar
**Updated 5/31/11**Important dates for the course in a convenient calendar format - Homework
**Updated 6/2/11** - MATLAB Assignments
**Updated 3/10/11** - Coordinates
**Updated 4/4/11**Meeting times, office hours & other contact information - Spring 2009 Exams in PDF format
- Midterm Exam 1
- Midterm Exam 2
- Final Examination. There is a typo in Question 5: the initial condition should be y(1) = 1.

**Note:**The above exams are provided "as is", exactly as they appeared when administered and without answers;

in addition, they may differ in form and content from the exams given this term. - Table of Laplace Transforms A copy of the table of Laplace transforms in Boyce & DiPrima. It will be provided at the final examination.

### Administrative Links

- Final Exam Responsibilities An outline of the responsibilities of faculty and students with regard to final exams
- Policies on Examinations The Academic Senate policy regarding final examinations (These are the rules!)

### Student Resource Links

- Online Calculus Community
- (Calculus) Online Community:
An email directory and bulletin board designed as a resource to help students find study
partners and communicate their questions (and answers) about the subject.
- [Thanks to the Office of Student Educational Advancement for providing this resource.]

- (Calculus) Online Community:
An email directory and bulletin board designed as a resource to help students find study
partners and communicate their questions (and answers) about the subject.
- Online Math Notes for Calculus, Differential Equations, Linear Algebra, and more from a professor at Lamar University.
- Sites with resources for assistance and tutoring
- Calculus Tutoring Information about the Math Department's Calculus Tutoring Lab and other tutoring resources
- OASIS UCSD's Office of Academic Support and Instructional Services
- Wolfram|Alpha Enter your question or calculation to compute the answer.

- Sites with helpful advice for studying Mathematics
- Interesting sites relating to Mathematics (If you see a Math site you like
that's not here, email me the URL.)

**Links:**Homework Calendar Syllabus Contact MATLAB*Home*- The ACMS computer lab where MATLAB Tutors will be officially stationed in is:
AP&M B432 Windows PC Lab (40 computers).
If AP&M B432 becomes full, students may also use the computers in the
2 neighboring ACMS labs across the hall from AP&M B432: