# Math 256: Introduction to differential equations

### Information for Dan Dugger's section, Winter 2012

Instructor: Daniel Dugger
Office: 317 Fenton
E-Mail: ddugger@math.uoregon.edu
Phone: (541)-346-4790

Office Hours: M 2-3, Tu 1-2, W 10-11, F 1-2.

Textbook: Elementary differential equations, 9th edition, by Boyce and DiPrima.

Syllabus: We will cover roughly chapters 1-4 and 7 of the textbook.

Grades: There will be FOUR midterms, held every other Friday starting on January 20th: so the dates are January 20, February 3, February 17, and March 2.
Grades will be calculated based on the following percentages:
Homework: 20%
Midterms: 13% each, for a total of 52%
Final: 28%

# Review sheets

Review sheet for midterm #1

Review sheet for final exam . You are not responsible for problems 31 through 37.

# Homework assignments

Homework will be due every Wednesday, starting 2nd week. Here are instructions for using Webwork. You can go directly to Webwork by clicking here.

You can find a useful table of integrals here. Just click on the list corresponding to the kind of function you want to integrate.

Assignment due 1/18:

• HW1 on Webwork.
• The following problems from the textbook (to be done on paper and handed in):
• Section 1.3: #18,20
• Section 2.2: #31, 32, 33 (only do parts a and b on these three)
• Section 2.5: 9, 10.
• Problems 2-5 on the following worksheet.

Assignment due 1/25: No Webwork this week. Hand in the following textbook problems:

• Section 2.4: 1-4, 7, 8, 10, 13, 15.
• Section 2.3: 1.
Assignment due 2/1:
• HW3 on Webwork.
• The following problems from the textbook (to be done on paper and handed in):
• Section 2.3: #4
• Section 2.6: #1-3, 16, 21.
Assignment due 2/8:
• HW4 on Webwork.
• The following problems from the textbook (to be done on paper and handed in):
• Section 3.1: #1,2,22.
• Section 3.2: #1,2,5,7,8,24.
Assignment due 2/15:
• HW5 on Webwork.
• The following problems from the textbook (to be done on paper and handed in):
• Section 3.4: #4, 18, 23, 24.
• Section 3.3: #3, 4, 5, 19.
• Section 3.5: #1, 3, 14.
Assignment due 2/22:
• Section 3.7: #1, 2, 3, 5, 6.

Assignment due 2/29:

• Section 3.6: #13, 15.
• Section 3.7: #11, 17, 24.
• Section 4.2: #11, 12, 14.
• Section 4.3: #1, 6, 9, 17.
• Section 7.1: #1, 5.
• Section 7.2: #1, 21, 22.

Assignment due 3/7:

• Section 7.5: #1, 2, 3, 8, 11.
• Section 7.6: #1, 2, 4, 6, 14.

Assignment for 3:16: This last assignment will not be handed in, due to dead week. But you are responsible for the problems below:

• Section 7.8: #1, 3.
• Section 7.9: #1, 3, 7.
• For Section 7.1, #22, 23: Write down the systems of differential equations, the initial values, and find the solution.