Introduction to Differential Equations (Spring 2022)

(Math 305, MWF 8:00-8:50AM, EGRA 220)

9.     Turtoring session: Mon-Thur, LIB 680 from 5:00-9:00pm

### Instructor:  Dr. Dashun Xu

Office: 273 Neckers Hall A Wing
Office Hours: MWF 9:55am-12pm, or by appointment

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

Zoom meeting room: 222 336 4190

### Syllabus (Attachment for more useful webpage and dates)

Last Day to drop with Refund: 01/21;  Last Day to drop w/o Refund: 03/27

### 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. Please make sure to refresh the webpage

 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, Due on Fri.   Please donot forget to staple your homework sheets together.   This webpage is updated according to the lecture pace in the morning (after 10:30am) on MWF. That is, you can get all HW due on Fri till on Wed after class. Week 3 2.1: 8, 20; 2.2: 6, 7, 13(a,c), 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, 21; 22, 25, Practice exam 1 (for you to review Chap 2)   HW due on Fri. Week 4 2.6: 26, 27, 28, 30; 2.4:  2, 5, 7, 2.4: 11, 28, 29, 30, 31 HW due on Fri. Week 5 2.5: 3, 4, 7, 10 3.1: 1, 3, 9, 13, 15, 20 HW due on Fri.   Please do the practice!!! Week 6 3.2:  3, 5, 9,  11, 13, 26 3.3: 7, 9, 11, 12, 15, 17 Due on Fri.   Collecting Announcements 1, 2, 3 on Fri.  (separate from HW)!!!   Exam on Fri!!! Week 7 3.3: 18,19, 22; 3.4: 7, 9, 10, 11, 13, 23, 25, 27,  28, 29, 30, Due on Fri. Week 8 3.3: 21 3.4:  12, 3.5: 1, 5, 3, 6, 7, 8, 10,  21-25(a) 3.5: 15, 16, 17, 18, 19. I am going to collect HW on Mon. after the break. Week 9 3.6: 3, 4, 5, 7,  13, 14, 16, 17 Due on Fri. Week 10 4.1: 14, 15 4.2: 13, 16, 14, 17, 19, 22, 23, 24, 29, 31, 33, 35 Due on Mon because I am going to help some HW problems in class on Fri Week 11 4.3:1, 3, 6, 9, 10, 4.3: 12, 13, 16, 18 HW due on Fri. Week 12 4.4: 2, 3, 6, 9, 10 Homework due on Fri. Week 13 10.1: 1, 2, 3, 4, 5, 14, 16, 18 Exam on Fri.   The exam covers Chap 3, 4 and 10.1. Week 14 10.2: 1, 2, 13, 14, 15 Due on Fri 10.3: 1, 2, 3, 10.3: 7a, 9a, 11a   10.4: 7, 8, 9, 15, 16, 24(a,b)     Option: 10.5: 1, 2, 5, 6, 10.5: 7, 8 after watching the video for 10.5. Week 15 Practice for the final:   Midterm exams and practice exams   Now, You can watch my videos for Midterm exams in D2L. Final exam: May 3, Tue. 8-10am, EGRA 220

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.