# Math 307 Winter Quarter 2021

• All classes will be online. You will need to watch video lectures and/or participate in online class each week via Zoom. Your instructor will supply details for your section.
• You will need a computer with a webcam, internet access, and a way to produce and upload handwritten work (your cell phone will suffice for uploading written work). If you don't have access to a computer, try The Student Technology Loan Program.You can find some documentation for Zoom below:
• Zoom Docs
• Exams -- Your insructor will provide you with specifics about quizzes and exams. Most will be adminstered using Gradescope and Zoom. These will require a computer, internet access, and a way to upload your work. A smartphone that can photograph your written work, or a tablet that can produce a pdf of your writing will suffice. See the instructions below for what appears to be the simplest methods.
• Gradescope Assignment -- Log in to Gradescope and begin an assignment, quiz or an exam.

Some related information on other ways to upload:
• WebAssign Log in to WebAssign here to read and submit homework. You will not be able to login at any other URL. 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.

• You will need to buy access ($22.95) and have two weeks to comply. Its best to wait until you are sure you are in a section that is using WebAssign.You don't need to buy any other Cengage products. In particular, you do NOT need Cengage Unlimited • The WebAssign payment process can be a bit complicated. See these Detailed Instructions for paying for WebAssign access The instructions were originally written for math 124. Where you see references to the Calculus text, you should look for "Math 307" instead. • Students outside the US can't pay for WebAssign in the usual way. See the Instructions for Paying from outside the US. Alternatively, try using a VPN, like HuskyOnNet. • WebAssign Office Hours via Zoom -- WebAssign representatives will help students with difficulties in registering or paying for WebAssign. • 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$25. You pay the bookstore at this link. You must pay for the book during the free access period. After that you can no longer purchase the ebook. 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 prefer a paper version, any edition of Elementary Differential Equations and Boundary Value Problems or Elementary Differential Equations by Boyce and Diprima 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.

• 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.

## Sample Schedule

Week Additional Materials Topics and Textbook Sections
1:
Jan 4-8
• Prerequisite Skills
• Some Basic Modelling § 1.1
• Solutions to Differential Equations § 1.2
2:
Jan 11-15
• Direction Fields § 1.1
• Euler's Method § 2.7
• Separable First Order ODE's § 2.2
3:
Jan.18-22
• No class Monday -- Martin Luther King Day
• Linear First Order ODE's § 2.1
• Modelling with First Order ODE's § 2.3
4:
Jan.25-29
MIDTERM #1 ARCHIVE
• Population Dynamics § 2.5
• Logistic equation
• Equilibria
5:
Feb.1-5
• Second Order Constant Coefficient ODE's § 3.1
• Homogeneous equations with distinct real roots § 3.1
• Complex Numbers---- notes on complex numbers
• Homogeneous equations with complex roots § 3.3
• Homogeneous equations with repeated roots § 3.4
6:
Feb.6-12
• Harmonic Oscillator § 3.7
• Method of Undetermined Coefficients § 3.5
7:
Feb.15-19
• No class Monday -- President's Day
• Forced Undamped harmonic Oscillator Beats and Resonance § 3.8
• Forced Damped Harmonic Oscillator -- Frequency Response and Phase § 3.8
8:
Feb.22-26
MIDTERM #2 ARCHIVE
• Laplace Transform -- definition as an integral § 6.1
• Tables of Laplace Transforms § 6.2
• Inverse Laplace Transform using tables § 6.2
• Solving IVP with Laplace Transforms § 6.2
9:
Mar.1-5
• Step functions and time delay § 6.4
• Delta Function, Impulse Response and Transfer Function §6.5
10:
Mar. 8-12
• Convolution §6.6
• Review for Final Exam
11:
Mar. 16-20
Final Exam Archive
• Final Exam week