## Email Archive

Archive of all email sent to the entire class.

Introduction to Differential Equations

Lecture B

Archive of all email sent to the entire class.

Subject: MATH20D_FA13_Bowers: Grades in Ted Date: December 16, 2013 8:05:52 AM PST Dear class, Grades for (most) students are posted in Ted. (If your grade does not yet appear, then it should appear in the next day or two.) Sincerely, Doc Bowers

Subject: WileyPlus Continued Access Date: December 11, 2013 7:50:57 PM PST Dear Math 20D Students, Now that the quarter has ended and the final exams have been taken, it is time to deactivate the WileyPlus component of your course. You will still be able to log into your account and view your scores, but you will not be able to access online resources such as the textbook or student solutions manual. ****If you would like to have continued access to these materials, then you can do so by using your SAME CODE to register for the "Math 20D Continued Access" WileyPlus course at the following URL: http://edugen.wileyplus.com/edugen/class/cls368545/ This will not cost you anything. The same code you used for your online homework will grant you access to this course, which will not have any homework, but will have the textbook and the other online resources. Sincerely, Adam Bowers, WileyPlus Coordinator

Subject: MATH20D_FA13_Bowers: CAPE Over 70% Date: December 9, 2013 7:37:23 AM PST Good news, everyone! The CAPE response rate this morning (Monday) is at 71.4%. Sincerely, Doc Bowers

Subject: MATH20D_FA13_Bowers: Midterm Solutions in Ted Date: December 7, 2013 12:25:41 AM PST Dear Class, I have posted (in Ted) solutions to Midterm #1 Version A and Midterm #2 Version A. You can find them both under "Content". Please be advised that it is very easy to make typos when typing solutions. Sincerely, Doc Bowers

Subject: MATH20D_FA13_Bowers: Final Week Announcements Date: December 5, 2013 5:46:08 PM PST Dear Class, Don't forget that our final exam is Dec 11 (Wed) 3:00 - 6:00 pm. Remember to bring a Blue Book and your photo ID. (We will be checking IDs during the final exam.) I will be holding office hours next week on Monday and Tuesday 2 - 4 pm: http://www.math.ucsd.edu/~abowers/office_hours.html Don't forget to take the Online Homework and Textbook Opinion Survey! Your opinion counts! https://www.surveymonkey.com/X/XXXXXXX [redacted] Sincerely, Ol' Doc Bowers

Subject: Math 20D Online Homework Survey Date: December 1, 2013 4:24:17 PM PST Dear Math 20D Students, You are receiving this email because your instructor used the WileyPlus online homework system this quarter. At this time, we would very much appreciate your feedback on the online homework system. Please follow the link below to complete a ten question survey about the online homework and the textbook used in this course. The survey is completely anonymous and has no effect on your course grade. https://www.surveymonkey.com/X/XXXXXXX [redacted] Your opinion counts and we will base our future homework and textbook decisions in part on the results of this survey. Thank you very much for your time. Sincerely, Adam Bowers, Math 20D Online Homework Administrator

Subject: MATH20D_FA13_Bowers: Examples from Section 5.2 Date: November 26, 2013 3:47:33 PM PST Dear class, I have posted a PDF to Ted that includes solutions for the four examples from Section 5.2 that we did in class. They were originally written for my own benefit, so they are handwritten and do not have every detail, but they include all of the most important points. The solutions are posted to "Content" in Ted. Sincerely, Adam Bowers

Subject: MATH20D_FA13_Bowers: Math 20D Homework Information Date: November 25, 2013 8:54:33 AM PST Dear class, All remaining WileyPlus homework assignments (HW 7 and HW 8) are now due Sunday, December 8. Sincerely, Adam Bowers

Subject: MATH20D_FA13_Bowers: Announcements Date: November 9, 2013 11:43:09 AM PST Dear class, Do to another obligation, I will not have office hours on Friday, Nov 15: http://math.ucsd.edu/~abowers/office_hours.html I typed up a complete solution to the Section 7.6 example I did in class yesterday. I also include a discussion of the phase portrait, complete with graph. I posted it to Piazza. You can find it here: https://piazza.com/class/hk4hcosk3z25qx?cid=103 Sincerely, Ol' Doc Bowers

Subject: MATH20D_FA13_Bowers: Math 20D Announcements Date: October 30, 2013 9:41:48 AM PDT Dear class, I have two announcements: 1. I will hold problems sessions after class on Mondays, where we will just work through some extra examples. This will be in our regular lecture hall after our regular lecture. The problem sessions are optional. We won't cover new material. I will just do extra examples. 2. I typed up a detailed solution to Section 3.5 Problem 20. I posted it in Piazza under "Resources": https://piazza.com/ucsd/fall2013/math20d/resources Sincerely, Doc Bowers

Subject: Math 20D Midterm Exam 1 Date: October 15, 2013 1:23:04 AM PDT Dear class, This is just a reminder that your first Midterm Exam is approaching. The exam is Monday, Oct 21 during regular class time. You can find it listed on the course calendar here: http://www.math.ucsd.edu/~abowers/20d/calendar.html The exam covers Sections 2.1 - 2.6, 3.1 - 3.4, which is everything we will have covered in class after this week. You may bring one (double-sided) page of handwritten notes. (No photocopies or scans.) No calculators or other electronic devices will be allowed during the examination. You must bring a Blue Book in which to write your exam. You can find all of this information, as well as examples of old midterms, on the class website: http://www.math.ucsd.edu/~abowers/20d/index.html#examinfo Make sure you are aware of Question Zero on the old midterm exam! You should expect to see something like that on your exam, too. Good luck everyone! Sincerely, Ol' Doc Bowers

Subject: MATH20D_FA13_Bowers: Math 20D Section 2.2 Problem 19a Date: October 6, 2013 9:02:21 AM PDT Dear class, I have written what I hope is a thorough explanation of how to do Problem 19a from Section 2.2. I posted it as a PDF in Piazza in "Resources" under "Course Page". Here is a link to where you can find it: https://piazza.com/ucsd/fall2013/math20d/resources Sincerely, Ol' Doc Bowers

Subject: Correction to Piazza Link Date: September 28, 2013 3:45:56 PM PDT Dear class, I just noticed that I gave you the wrong link for the class Piazza page. The correct URL is: https://piazza.com/ucsd/fall2013/math20d The link I sent you by accident is also one you should be aware of. We did not talk about it in class yesterday, but there is also a MATLAB component to this course. Information about the MATLAB assignments can be found at the link I gave in the last email: http://www.math.ucsd.edu/~math20d/ Sincerely, Adam Bowers

Subject: Math 20D Start of Quarter Date: September 28, 2013 3:30:07 PM PDT Dear Math 20D Class, We made it through the first day! Everything you need to know about the course you can find on the class webpage: http://math.ucsd.edu/~abowers/20d/index.html The class website has a syllabus, course calendar, and links to all of the resources. To register for WileyPlus (if you have not already done so), follow this link: https://edugen.wileyplus.com/edugen/secure/student/index-mwp.uni? When you click on "Create Account", it will give you the option to register with a 14 day grace period. This will give you two weeks to decide if you want to pay for the course or not. To register for our class Piazza forum, click here: http://www.math.ucsd.edu/~math20d/ See you on Monday! Sincerely, Adam Bowers (@DocBowers)

Subject: Math 20D: First day of classes Date: September 26, 2013 7:56:24 AM PDT Dear Students, This email is to remind you that there are no Math 20D discussion sections today. The first day of instruction is tomorrow, Sep 27 (Friday): http://www.math.ucsd.edu/~abowers/20d/calendar.html Sincerely, Adam Bowers @DocBowers

Subject: Math 20D Fall 2013 Date: September 23, 2013 4:01:47 PM PDT Dear Students, You are receiving this email message because you are enrolled in Math 20D Lecture B at UCSD this Fall Quarter. *Math 20D Course Website* Everything you ever wanted to know about the course (and more) can be found on the course website: http://www.math.ucsd.edu/~abowers/20d/index.html *First Day of Classes* Please be aware that there are no Math 20D discussion sections on Thursday, September 26. The first day of instruction will be Friday, September 27. Please see the course calendar for more information: http://www.math.ucsd.edu/~abowers/20d/calendar.html *Textbook and Online Homework* The textbook for this course is "Elementary Differential Equations" (10th Edition), by Boyce and DiPrima (published by John Wiley & Sons, Inc. 2013). We will be using the publisher's online homework system called WileyPlus. For this reason, you must buy a copy of the book that has the WileyPLUS online homework code. If you buy your book at the UCSD bookstore, it will come bundled with the code. If you buy a used book, or an earlier edition of the book, then you will have to buy the code separately. This can become very expensive! NOTE: If you want ELECTRONIC ACCESS ONLY to the textbook, you can buy the WileyPLUS code separately. Then you do not need to buy a physical copy of the book. This is the cheapest option. (And you can have access for free for 14 days.) If you want electronic access only to the book, then register with WileyPlus using the link on this webpage: http://www.math.ucsd.edu/~abowers/20d/wiley.html I hope everyone will have an enjoyable Fall Quarter. Sincerely, Adam Bowers

Subject: Math 20D Fall 2013 Date: September 11, 2013 4:37:16 PM PDT Dear Students, You are receiving this email message because you are enrolled in Math 20D Lecture B at UCSD this Fall Quarter (with me). Even though Fall Quarter does not start until September 23, there are a few things about the course that you may want to know now. *Math 20D Course Website* Everything you ever wanted to know about the course (and more) can be found on the course website: http://www.math.ucsd.edu/~abowers/20d/index.html *Textbook and Online Homework* The textbook for this course is "Elementary Differential Equations" (10th Edition), by Boyce and DiPrima (published by John Wiley & Sons, Inc. 2013). We will be using the publisher's online homework system called WileyPlus. For this reason, you must buy a copy of the book that has the WileyPLUS online homework code. If you buy your book at the UCSD bookstore, it will come bundled with the code. If you buy a used book, or an earlier edition of the book, then you will have to buy the code separately. This can become very expensive! NOTE: If you want ELECTRONIC ACCESS ONLY to the textbook, you can buy the WileyPLUS code separately. Then you do not need to buy a physical copy of the book. This is the cheapest option. (And you can have access for free for 14 days.) If you want electronic access only to the book, then register with WileyPlus using the link on this webpage: http://www.math.ucsd.edu/~abowers/20d/wiley.html *First Day of Classes* Please be aware that there are no Math 20D discussion sections on Thursday, September 26. The first day of instruction will be Friday, September 27. Please see the course calendar for more information: http://www.math.ucsd.edu/~abowers/20d/calendar.html I hope everyone will have an enjoyable Fall Quarter. Sincerely, Adam Bowers