Math 261, Fall 2022

Math 261 - Elementary Differential Equations
Fall 2022

Syllabus

Unforgivable Math Errors

Announcements:
- The final exam will be given on Wednesday, December 14 from 10:00 to 11:50 in the normal lecture room. It will cover material from the entire course. You may prepare and bring one 8.5" by 11" sheet of paper with any formulas, problems, or any other information you would like to use on the exam. You can use both front and back of this sheet. Additionally, you may use a scientific calculator. To help you study for the exam, you may wish to review this list of exam material and this list of practice problems.

Homework Assignments

Homework 1, due Friday, August 26:

Section 1.1, pages 10-11: #2, 4, 5, 12, 16, 17, 23, 32, 36
Section 1.2, pages 17-18: #1, 4, 7, 8, 12, 14
Section 2.2, pages 51-52: #2, 4, 5, 6, 9, 12, 13, 14, 15, 23, 26, 31, 32

Homework 2, due Friday, September 2:

Section 2.3, pages 62-63: #2, 3, 4, 6, 11, 14, 26, 27, 28, 37
Section 2.4, pages 70-71: #2, 5, 8, 12, 15, 22, 23, 29, 30

Homework 3, due Friday, September 9:

Section 2.5, page 75: #1, 4, 6, 9, 10, 14, 17, 18, 22
Section 3.1, pages 91-93: #1, 4, 6, 9, 13, 14, 16, 21, 23, 24

Homework 4, due Friday, September 23:

Section 4.1, pages 130-131: #1, 2, 4, 14, 16, 18, 19, 25, 27, 31, 32
Section 4.2, page 134: #1, 2, 6, 10, 11
Section 4.3, pages 140-141: #4, 5, 8, 10, 11, 14, 15, 18, 32, 33, 34, 40

Homework 5, due Friday, September 30:

Section 4.4, pages 150-151: #3, 4, 8, 12, 19, 22, 24, 28, 31, 38
Section 4.6, page 165: #4, 12, 13, 14, 15, 26
Section 4.7, page 171: #1, 6, 10, 14, 20, 23, 24

Homework 6, due Friday, October 14:

Section 5.1, pages 209-212: #2, 3, 4, 6, 7, 8, 21, 22, 23, 24, 27, 28, 37, 38

Homework 7, due Friday, October 21:

Section 7.1, page 285: #1, 2, 6, 12, 13, 20, 24, 28, 32
Section 7.2, pages 293-294: #3, 8, 12, 14, 18, 20, 26, 35, 36, 40

Homework 8, due Friday, October 28:

Section 7.3, pages 303-305: #2, 7, 8, 16, 22, 29, 37, 38, 43, 48, 49-54, 58, 65, 66
Section 7.4, pages 315-316: #1, 2, 8, 10, 12, 25, 31, 36, 43, 46, 53, 55

Homework 9, due Friday, November 4:

Section 6.1, pages 242-243: #1, 2, 10, 11, 12, 14, 23, 24, 26, 27, 28, 30, 31, 36, 38

Homework 10, due Friday, November 11:
Note: When asked to find power series solutions, give at least 4 non-zero terms of the series.

Section 6.2, pages 251-252: #3, 4, 7, 8, 10, 20, 21

Homework 11, "due" Wednesday, November 16: (Feel free to turn it in on Friday, but the exam is Wednesday)

Section 6.3, pages 260-261: #1, 3, 8, 13, 14, 17, 21, 25, 26 (for 25 and 26, do NOT use equation (23) to get a second solution)

Homework 12, due Friday, December 2:

Section 11.1, page 430: #1, 2, 12
Section 11.2, pages 435-436: #4, 9, 13
Section 11.3, pages 442-443: #11, 14, 17, 25, 32, 33, 44

Homework 13, due Wednesday, December 14:

Section 12.1, page 464: #1, 2, 5, 6, 8, 10, 11, 12, 13

Old Announcements:
- As per the email I sent, the classroom for lectures has been changed to INN 301.
- Exam 1 will be given in class on Friday, September 9, and will cover the material in sections 1.1, 1.2, 2.2, 2.3, 2.4, 2.5, and 3.1. You may bring and use a scientific calculator, but no graphing or programmable calculators will be permitted.
- Exam 2 will be given in class on Friday, September 30, and will cover material in sections 4.1, 4.2, 4.3, 4.4, 4.6, and 4.7. You may bring and use a scientific calculator, but no graphing or programmable calculators will be permitted.
- Exam 3 will be given in class on Friday, October 28, and will cover material in sections 5.1, 7.1, 7.2, 7.3, and 7.4. You may bring and use a scientific calculator, but no graphing or programmable calculators will be permitted. You will be given a copy of the Laplace transform table from class.
- Exam 4 will be given in class on Wednesday, November 16, and will cover material in sections 6.1, 6.2, and 6.3. You may bring and use a scientific calculator, but no graphing or programmable calculators will be permitted.