## 21-260: Differential Equations

# Scheduling Information

**Lecture 1:** 10:30-11:20 in BH A51 (regular lecture room)
**Lecture 2:** 12:30-1:20 in McConomy Auditorium (in the University Center).
**Review Session:**

Time: Tuesday 14 February, 7:00-8:30pm
Place: PH 100.
**Office Hours:** I'll post any changes for next week.

Alex Rand: "I will be in my office next week on Tuesday from 11-12 and 3:30-4:30 in
addition to the usual Monday from 4:30-5:30."
Jeff N Eisenbeis: "You can add 1 hour to my Tuesday morning in place of Wednesday at 5pm. This
yields Tue 9-noon in OSC 206."
Josh Taylor: "I [will] extend my usual Tuesday hours, which
are from 2:30 - 3:30, an extra two hours and not hold my other two office
hours. Then my office hours for next week would be: Tuesday 2:30 - 5:30."
**Homework:** You may pick up your graded HW#4 (as well as earlier
homeworks, if you
have not already done so) from your TA during their
office hours.

# Exam #1 Review:

**Read:**

Section 1.1, pp. 1-7.
Section 1.2.
Section 1.3, pp. 17-20.
Section 2.1.
Section 2.2.
Section 2.3.
Section 2.4, pp. 64-72
Section 2.5.
Section 2.7, pp. 96-103.
Section 7.1.
**Exercises:** Remember, no calculators, laptop computers,
cybernetic implants, etc. will be allowed for the exam. When working
on these problems you should focus on techniques involving only pencil,
paper, and your (biological) brain.

Section 1.1: #1, 3, 5.
Section 1.2: #13, 15.
Section 1.3: #1, 5, 7, 9, 17, 26.
Section 2.1: #17, 19, 20, 29.
Section 2.2: #1, 3, 13, 15, 16.
Section 2.3: #3, 4, 6, 9, 18.
Section 2.4: #1, 4, 11, 12, 26.
Section 2.5: #1, 12, 13, 20, 22.
Section 2.7: #3, 21.
Section 7.1: #2, 4, 6, 23,
**Previous Exam Problems:**

All of these problems (or versions of them) were given as 21-260 exam
problems in a previous semester. Available as
a pdf file.