Introduction to Differential Equations  (Spring 2020)

(Math 305, MWF 12:00-12:50PM)

9.     Group study: Tuesday, LIB 654 from 4:00-6:00pm

### Instructor:  Dr. Dashun Xu

Office: 273 Neckers Hall A Wing
Office Hours: MWF 9:00-11:00am, or by appointment

E-mail: dashunxu@siu.edu  Phone: 453-6512

### All assignments will be collected every Friday in class and only a few questions in each assignment will be graded. Late homework will not be accepted. The followings are problems assigned last time. I will update these problems after each class meeting.

 Date Homework Week 1 Week 2 1.3: 1-6, 8, 9;; 2.1: find the general sol. to 1,3,5,7, 8 2.1: 9,11(part c), 13, 15, 17, 19;; 2..2: 1, 2, 5, 6, 7, 13(a,c);; optional: 23 Due on Fri.   Please donot forget to staple your homework sheets together. Week 3 2.1: 8, 20; 2.2: find the solution to 14, 22; 2.6: 2, 3, 4, 5, 7, 8, 2.6: 9, 13, 14 (find the solution); 2.6: 18, 22, 25, 26, 27;; Practice exam 1 (for you to review Chap 2) Week 4 2.6: 28, 30 2.4: 2, 5, 7, 11, 2.4: 28, 29, 30, 31 2.4: 31 Week 5 2.5: 3, 4, 7, 10   3.1: 1, 3, 9, 13, 15, 20 Exam on Fri!!! Week 6 3.2:  3, 5, 9, 11, 13, 26 3.3: 12, 15,   3.3: 18,19, 22; Week 7 3.4: 7, 9, 10, 11, 13, 23,25, 27, 30 Week 8 3.5: 1, 5, 3, 6, 7, 8, 10, 15, 21-25(a) Week 9 3.5: 15, 16, 17, 18, 19. 3.6: 3, 4, 5, 7,  13, 14, 16, 17 4.1: 14, 15 4.2: 13, 16, Due on Fri. Week 10 4.2: 14, 17, 19, 22, 23, 24, 29, 31, 33, 35 4.3:4, 7, 9, No Late homework, please. Week 11 4.3:1, 3, 6, 9, 10, 4.3: 12, 13, 16, 18 4.4: 2, 3, 6, 9, 10 Week 12 10.1: 1, 3, 4, 5 10.1: 2, 14, 16, 18 Exam on Fri???   Homework due on Fri too. Week 13 10.2: 1, 2, 13, 14, 15   10.3: 1, 2, 3, Week 14 10.3: 7a, 9a, 11a   10.4: 7, 8, 9, 15, 16, 24(a,b)   10.5: 1, 2, 5, 6 Week 15 More practice problems 10.5: 7, 8     Practice for the final:   Midterm exams and practice exams, Final exam: May 4, Mon. 8-10am, EGRA 320

Study Hint:

Find at least one or two other students from the class with whom you can regularly do homework and prepare for exams. Your classmates are perhaps the least used and arguably your best resource. An efficient and effective study group will streamline homework and study time and greatly improve your written and spoken communication. The best time to use your classmates as study/homework partners is after you have made an honest effort on your own to solve the problems using your own wits, knowledge, and experience. When you encounter an unsolvable problem, don't give up too soon on it. Being stumped is an opportunity for mathematical growth and insight, even if you never solve the problem on your own. If you seek help prematurely, you will never know if you could have solved a tough problem without outside assistance.