Math 207: Dept of Math, Univ of Washington

# Math 207 Spring 2023

• What you need :
• Webassign. The instructions on how to access Webassign differ depending on your section.
• If you are in Sections A or B in Spring 2023, then you follow the steps at this link. See also your instructor's Canvas page for further details.
• The following instructions are for students in Sections E,F, and J: log in to WebAssign here to read and submit homework. You will not be able to login at any other URL. You should click the "Login @ University of Washington" button in the lower left corner of the screen. Don't click the button in the upper right corner. Here is a screenshot. If you google WebAssign, you will not find the correct site for University of Washington. If you think you need a "class key", you are using the wrong URL. If you are having trouble logging in or paying for WebAssign, call the help number 800.354.9706 or contact your instructor. Don't go to the math advising office; they cannot help you with WebAssign.

• For all sections, you will need to buy access ($22.95) and have two weeks to comply. It's best to wait until you are sure which section you are in, then follow these instructions to pay for WebAssign • WebAssign Office Hours -- UW WebAssign representatives will help students with difficulties registering or paying for WebAssign. Zoom links, with dates and times, are as follows: • A common mistake among first time WebAssign users is to type "xy" to indicate "x times y". Typing "x" followed by "y" is interpreted as a new variable with the two letter name "xy". To indicate "x times y", you should type "x*y" or "x space y". When you look at the typeset answer, you won't be able to see the difference between "xy" and "x space y". That's why I prefer to type "x*y", although I do tend to get lazy at times and just type "x space y" • Textbook. Introduction to Differential Equations by Boyce, Diprima, and Meade : You can access the etext from your class Canvas page. Access is free for 10 days, then it will cost$26. You pay the bookstore at this link. You must pay for the book before the end of the free access period. After that you can no longer purchase the ebook. After your purchase, you can read the book online or download and use the VitalSource reader. You can print up to 10 pages at a time as well. The downloaded version doesn't expire.

If you can't find the link to the etext, contact your instructor. If you have trouble with the payment process, or the link isn't working, contact the University Book Store Course Materials Department by phone at 206-634-3400 x332 or by email inclusive.access@ubookstore.com

If you prefer a paper version, any edition of Elementary Differential Equations and Boundary Value Problems or Elementary Differential Equations will do. A custom version is available through the bookstore. Older versions are cheaper. You don't need to buy the solutions manual. The WebAssign homework is different from the homework problems in the textbook, so the solutions manual will not be particularly useful.

• Math 207 Grade Policy. The department of mathematics has adopted a grade policy for this course. The median course grades for each section of Math 207 taught during the regular academic year will fall within the range of 3.0 +/- 0.2

## Sample Schedule

Week Additional Materials Topics and Textbook Sections
1:
• Prerequisite Skills
• Some Basic Modelling § 1.1
• Solutions to Differential Equations § 1.2
• Direction Fields § 1.1
2:
• Separable First Order ODE's § 2.2
• Linear First Order ODE's § 2.1
• Modelling with First Order ODE's § 2.3
3:
• Population Dynamics § 2.5
• Euler's Method § 2.7
• Review for Midterm 1
4: MIDTERM #1 ARCHIVE
5:
• Homogeneous equations with complex roots § 3.3
• Homogeneous equations with repeated roots § 3.4
6:
• Method of Undetermined Coefficients § 3.5
• Harmonic Oscillator § 3.7
7:
• Forced Undamped harmonic Oscillator Beats and Resonance § 3.8
• Forced Damped Harmonic Oscillator -- Frequency Response and Phase § 3.8
• Review for Midterm 2
8: MIDTERM #2 ARCHIVE
• Midterm 2
• Laplace Transform -- definition as an integral § 6.1
• Tables of Laplace Transforms § 6.2
9:
• Inverse Laplace Transform using tables § 6.2
• Solving IVP with Laplace Transforms § 6.2
• Step functions and time delay § 6.3 § 6.4
10:
• No class Monday -- Memorial Day
• Impulse/Delta Functions §6.5
• Review for Final Exam
11: Final Exam Archive
• Final Exam week

Religious Accommodation Policy: Washington state law requires that UW develop a policy for accommodation of student absences or significant hardship due to reasons of faith or conscience, or for organized religious activities. The UW's policy, including more information about how to request an accommodation, is available at Religious Accommodations Policy. Accommodations must be requested within the first two weeks of the course using the Religious Accommodations Request form.