C o o r d i n a t e s   (2,5,0)

Math 250: Differential Equations
Instructor: Joe Erickson (erickson@bucks.edu)
Textbook: A First Course in Differential Equations, 10th Ed., by Dennis Zill
Term: Spring 2016


May 13 - Exam #4 and its key are in Resources now. Well, I haven't typed up the solution to #3 yet, but soon...

May 4 - There will be class on Wednesday, May 11, which will allow us to finish up Laplace transforms. (This is a make-up day for us, since one class was missed a while back, so expect the parking to be good on campus.) The last exam is on Monday, May 16, at 6:30 pm in the usual room. Another option: Tuesday, May 17, at 6:30 pm in room 204. Finally, Exam #3 and its key are in the Resources section of the site.

April 10 - Exam #3 will be on April 20 and cover sections 4.2, 4.4, and 4.6.

April 6 - Exam #2 and its key are in the Resources section of the site.

April 5 - The syllabus below now has updated office hours.

March 28 - We will have Exam #2 on March 30, however it will cover only sections 3.1, 4.1, and 4.3. Section 4.2 will be pushed to Exam #3.

March 23 - Unfortunately I have to cancel class today. We'll meet again next week.

March 11 - Good news: I've decided to add 5 more percentage points to everyone's Exam #1 score. So for example if you got 87% on the exam, you now have 92%. I do not believe any of the problems on the exam were unreasonably difficult; however the argument could be made that the exam was somewhat overly long.

March 2 - Exam #1 and its key are in the Resources section of the site (link below).

January 21 - Office hours are now in the syllabus (link below).

December 8 - The book assumes some familiarity with the hyperbolic functions. You need to know the definitions of sinh and cosh. The definitions of the other four hyperbolic functions follow in a manner analogous to the trigonometric functions: tanh=sinh/cosh, sech=1/cosh, and so on. Also know the derivatives of sinh and cosh, which are easy: sinh'(t)=cosh(t), which is like sin'(t)=cos(t), and cosh'(t)=sinh(t), which is almost like cos'(t)=-sin(t). See this page for the full lowdown on hyperbolic functions.

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