Lectures are on MWF, 2:30-3:20 and 3:30-4:20. Here is the contact information you'll need:
lindsay@math.washington.edu Office: ART 336 Office Hours: see below, and by appt. |
You can attend any of the following office hours in CMU B-014. Come prepared to work with your classmates: this is often a faster way to get help when it's crowded.
| M | 12:30-1:30, Austin Roberts 3:30-4:30, Peter Caday 5:00-6:00, Louis Fan |
| T | 1:00-3:00, Mary Radcliffe 3:30-5:30, Lindsay Erickson |
| W | 11:30-12:30, Austin Roberts |
| Th | 11:30-12:30, Huy Tran 12:30-2:30, Christian Rudnick |
| F | 10:30-11:30, Peter Caday 11:30-12:30, Huy Tran |
Sometimes we will change our office hours, and in that case we will always try to inform you by email. If you're unsure, you can email the instructor whose office hours you hope to attend. Just search for the instructor's name and address: look on the faculty page for Mary, and the grad student page for everyone else.
See the calendar.
See the syllabus.
See other materials.
Check your grades on Catalyst.
Visit CLUE for tutoring.
Eigth edition vs. ninth edition?
See the rules for quizzes and exams.
Topics for the final.
Math 307I/307J, Winter 2013
Welcome to Math 307!See the homework assignments at the bottom of the page. Click here for the calendar, and click here for the class materials.
Announcements
March 18: Another instructor, Mary Radcliffe, made an epic review sheet and she invited me to share it with you. Here it is. Note that it covers some topics that you won't have on the exam; you should check the list of topics I posted below in the March 11 announcement to see what you need to worry about. Enjoy!March 16: I have posted an improved solution to one of the practice problems from yesterday's class here. Also, check your email for a note about one other problem we saw in class. Scroll down to the Feb. 25 announcement for a link to the exam archive. Good luck on the final, and see you on Tuesday or Thursday!
March 11: First, two important notes about the final. You may use two note sheets, front and back, handwritten in your own handwriting. Same rules about calculators as on the midterms. Also, the last page of the final exam will be an exact photocopy of p. 317 in the textbook. So you do not need to memorize or write down the elementary Laplace transforms. Of course, you need to know how to use them!
On Wednesday we'll cover the last new material of the quarter (section 6.4). Friday will be a day of review for the final. I'd like to run the review like I did for the midterms: that is, I'll bring in old exam problems (that don't have solutions easily available online), and you will work on them and talk to your classmates and me about them. At the end, I'll give you short solutions to check your work.
The topics for the final can be found here. If you'd like to review anything in particular, you can fill out this Catalyst survey before 9PM on Thursday, or just email me with your request. Otherwise, just come to class prepared to practice!
March 8: Your fifth and final quiz will be available on Catalyst today at 4:30. It will close on Monday at 2:15 PM. Read the quiz rules here. The quiz is on some of the material from section 6.2. Specifically, the quiz is about manipulating functions of a variable s in order to take the inverse Laplace transform of them, like we did in the long example in class on 3/6. As usual, you have two hours to complete it, which should be plenty. There is a note on the first page of the quiz that you should read before going on to page 2 (where the four questions are).
Also, HW 7 is up below. It is due next Friday, on the last day of class.
March 7: I posted a solution to the problem I suggested at the end of class yesterday. In Section I there was an error in my solution, and I wanted to follow up with a corrected version. Check it out and be sure it makes sense!
March 4: You'll have your last quiz (Quiz 5) online this weekend. It will be available on Friday and due on Monday. I'll say more about it in class on Friday, but expect it to be on section 6.2. Same rules as before.
February 25: Here's a link to the old exam archive I sent you before the last midterm. Most of the problems from today were from one of Chris McMurdie's midterms. The fifth problem was from a Spring 2012 final exam that you can see (with solutions) here. I wrote it down incorrectly on the board: I should have specified that omega=2.
Same rules for this midterm: one sheet of notes (front and back OK), simple scientific calculator OK but not required, no fancy graphing calculators or cell phones.
The midterm is only on Chapter 3. I won't be asking you for anything that only uses Chapter 2 stuff (e.g. Newton's law of cooling, or mixing problems). On the other hand, some of the stuff from Chapter 2 does make an appearance in Chapter 3 (most notably in reduction of order), so you should know Chapter 2 material insofar as it relates to Chapter 3.
February 22: Quiz 4 solutions are up on the materials page. Be sure to check it out if you had any trouble: this type of problem includes many steps, and is quite important to be able to do. Over the weekend, watch this neat video of the Tacoma Narrows Bridge collapse in 1940. This is not quite an example of resonance: the cause of the collapse was determined to be aeroelastic flutter. However, this is an example of the type of thing engineers worry about when they try to correct for resonance effects.
February 19: Since I'm not allowing notes on the quiz but I don't want you to spend all your time remembering formulas, I'll include the useful ones on the quiz. You can see the top section of the quiz here. Same rules as before: no notes, no graphing calculators.
February 18: I announced in class on Friday that Wednesday's quiz will be one initial value problem about a spring-mass system, in the style of the problems from Worksheet 2 and in the HW from 3.7. No notes, but since you have such a specific idea of what the quiz will be on you should be fine. You may use a calculator, but you won't need to. However, I do expect you to know the trig functions evaluated at the usual unit circle angles (e.g. cos(0), sin(pi/2)...). And you should be able to simplify expressions like e^(2*ln(t)).
February 12: The MSC will be closed next Monday for President's Day, so no joint office hours that day. The rest of the schedule should be normal. Your next homework (HW 5) is due on 2/25, and it will be a big homework covering all the rest of Chapter 3. So far I have posted one Euler equation for HW 5, and more is coming when we get there. By the way, I am not sure if I remembered to mention in class: you can use the formula for the change-of-variables in Euler equations on page 165 of the book (equation (iii)). You don't need to re-derive it every time, but I did want you to see where it comes from.
February 6: At 4:30 today, Quiz 3 will be available. It closes at 2:30 on Friday, so be sure to fill it out before then. Read the quiz rules before you start. There is a 2-hour time limit, and the quiz is on solutions to second-order linear homogeneous DEs with constant coefficients.
February 4: HW 4 is now posted below. It is due next week. So far we've done enough for all the 3.4 problems except for the last one, which we'll cover on Wednesday. Also, that 3.2 problem is not a typo! We'll talk about that one Wednesday as well. Finally, note that Quiz 4 will be in class on February 20.
February 2: First: there will be another online quiz next week. It will be on the material from 3.1, 3.3, and 3.4. It'll be available on Wednesday at 4:30 and due at 2:30 on Friday.
Yesterday in class, some of you said you would like a proof of Euler's formula. You got it! I wrote down how you would derive Euler's formula for eib and posted it here. If you're at all curious, you should check it out: it's not hard, and I think you will find it much less shocking (and maybe even kind of neat) once you do it yourself.
January 30: Solutions to the midterm are up on the materials page. You'll get your test back in class today. Overall they were pretty good; I'll say a few more things about the test in an email soon. Homework 3 is posted below, due next week.
January 23: Check out the list of shared office hours to the right. Note that there are a couple changes this week: you should have received emails about them yesterday.
January 21: Visit the new materials page for solutions to the in-class worksheet and quiz from Friday.
January 17: HW 1 is due tomorrow in class. HW 2 is now due next Friday (moved from Wednesday), and I have added one problem from 2.7. You can read the rules for in-class quizzes on the rules page.
January 14: HW 1 is now tentatively due on Friday, due to the bookstore being out of stock of the course text. On Wednesday I'll give an update about the due date. Also, there will be a quiz on Friday in class. It will be one question on modeling, so something like the questions in 2.3. My goal is to get you some feedback (in the form of a graded quiz) before the first midterm in Week 4.
My office hour location has changed. I will now be in the Math Study Center in the Communications building (room B-014). I'll be in an office to the right of the reception desk; you can ask whoever is at the desk where to find the 307 people.
January 11: At 4:30 PM today, Quiz 1 will be available. It is on Section 2.1. You will need to solve a differential equation. Integration by parts and u-substitution are fair game; you won't need to use partial fractions. The quiz closes on Monday, January 14, at 2:30 PM. If you haven't submitted it by then, you won't be able to. Read the rules for quizzes before you start.
January 9: I made an important quiz announcement in class today. One of the questions on your first quiz (over the weekend) will require you to write the first and last name of a classmate whose contact information you have. This person is who you should talk to if you have to miss class or forget something. Many of you found your person today in class. If you didn't yet, you still have Friday to do it.
Also, some of you asked about using the eigth edition of the textbook. This is possible, but do so at your own risk. The numbering of the exercises is often different, and you are responsible for doing the right homework problems. If you wish to use the eigth edition, you can find a list of changes for the ninth edition here, by Professor Hart Smith. Some problems are new in the ninth edition, so you will probably have to consult a ninth edition at least once.
Introductory stuff: Click here for the calendar, which will be updated as we go along. Here is the syllabus, distributed in class on the first day.
Your first quiz will be available online through Catalyst on Friday, 1/11. You must complete it before 2:30PM on Monday, 1/14.
You might like to use this slope field generator by Nathan Grigg.
Homework Schedule
Homework is due on the dates indicated on the calendar.Homework 7:, due on 3/15:
| Section | Problems |
| 6.3 | 1, 2, 7, 13, 14, 19, 24 |
| 6.4 | 2, 3, 5 |
Homework 6:, due on 3/8:
| Section | Problems |
| 6.1 | 5, 12, 22 |
| 6.2 | 1, 2, 3, 7, 11, 16, 23 |
Homework 5, due on 2/25 (and now complete!):
| Section | Problems |
| 3.3 | 37 |
| 3.7 | 5, 6, 7, 11, 24 |
| 3.8 | 5, 7, 10, 12 |
Homework 4, due on 2/13:
| Section | Problems |
| 3.4 | 4, 11, 15, 21*, 26 |
| 3.2 | 28 |
| 3.5 | 1, 2, 5, 7, 14, 18 |
Homework 3, due on 2/6:
| Section | Problems |
| 3.1 | 1, 8, 9, 16, 17, 21 |
| 3.3 | 2*, 3, 10, 18, 19, 20 |
Homework 2, due on 1/25:
| Section | Problems |
| 2.3 | 5, 8, 12, 13, 19 |
| 2.5 | 3, 5, 7, 20, 22 |
| 2.7 | 2 |
Homework 1, due (really) on 1/18: The section numbers refer to the textbook.
| Section | Problems |
| - | Math 125 review. Find antiderivatives of these three functions: sqrt(x), (5x)/(x^2+1), and (x^2)*(e^x). |
| 1.1 | 3, 9, 16, 18 |
| 1.2 | 9 |
| 2.1 | 1, 10, 14, 16, 31 |
| 2.2 | 2, 3, 22, 23, 27 |
For this homework (and always), feel free to use an online direction field generator (or program your own!). But please do make a sketch of the slope field when asked to draw one in your homework.