Math 221-- Differential Equations
Section 002
Fall 2004

Instructor:   Petronela Radu
                                Office: AVH 239
                                Phone: 472-9130
                                 E-mail: pradu@math.unl.edu
Office Hours:   11:00-12:30 Tuesday & Thursday
                           or by appointment

Schedule of the class:
  9:30-10:45  Tuesday & Thursday
Room:         BURN 119

Text: G. Ledder, 2005. Differential Equations: A Modeling Approach, McGraw-Hill, New York.
 
Final Exam: A comprehensive final examination is given during final examination week (Dec 13—17) at its regularly scheduled time (see UNL “Schedule of Classes 2004—2005”). You must arrange your personal schedule to permit you to take the exam at the regularly scheduled time. 
 
Withdrawl Date: Friday, November 12, is the last day to drop the course with a “W”.
 
Holidays: Mon Sept 6 (Labor Day); Mon-Tues Oct 18-19 (Fall break); Thus-Fri Nov 25-26 (Thanksgiving).
 
Computer Lab / Calculators: Students will be given an account in the Mathematics Department Computer Laboratory in Avery 18. In this section of the course, the use of a computer algebra system is
not required, but it is encouraged for gaining more insight into the material. Student versions of CAS (MATLAB, Maple, or Mathematica) are available for purchase in the campus computer shop.
 
Daily Work: The exercises below represent a minimal suggested assignment from the text. Some students may have to work additional problems to master the material.

Topics: The text is flexible and adapts itself to several different course styles. Math 221 covers material in Chapters 1—7 of the textbook. The syllabus used in this section covers the material in the order Chapters 1, 2, 3, 5, 6, 4, 7, to get to the phase plane (Chapters 5, 6) quickly. Some adjustments may be made as the semester progresses.
 
WEEK OF    SECTIONS    PROBLEMS
Aug 23        1.1        p11: 3,5,7,9,12,13a.
                   1.2        p27: 3,9,11,13,14ab,17,19,20,25,27,28,29,31.
                   1.3        p39: 1,3,5,8.  p46: 5
Aug 30        2.1        p58: 1,7, 13,14.
                   2.2        p72: 1,3,7,15,17,19,23,39.
                   2.3        p83: 1,7,11,13.
Sept 6         2.4        p93: 1,3,11,13,15.
                   2.5, 2.6    p106: 3,7,10.   p116: 3,6
                   Review         
Sept 13       Exam 1
                   3.1        p135: 1,7,9,13,15.  Review Sec 3.2.
                   3.3        p160: 1,7,13,17.
Sep 20         3.4        p168: 1,3,7,9,11.
                   3.5        p177: 1,3,9,13.
                   3.6        p186: 1,2,5.
Sept 27       5.1        p286: 1,3,7,11,12,13,14.
                   5.2        p295: 2—9,12,13,15,16.
                   5.3        p308: 1,2,5,15,17,18.
Oct 4           5.4        p318: 1—15 (odd)
                   5.5        p326: 1,5,7,10,11,12.
Oct 11         Exam 2
                   6.1        p341: 1,2,17,18.
Oct 18         6.2        p354: 1,2,3,5,6,7,9,11,16,17,19,25.
                   6.3        p364: 1,3,7,9,10,11,13,17.
Oct 25         6.4        p375: 1,5,7,9,13,17,20.
                   6.5        p385: 1,3,5,7.
Nov 1          6.6        p396: 1,3,5,7,11.
                   6.7        p408: 1,3,5,7,9,10.
Nov 8          4.1        p216: 1,3,5,7,11.
                   4.2        p226: 1,2,3,5,9,10,12.
                   4.3        p239: 7,9,10,13.
Nov 15        Exam 3
                   4.4        p251: 3,4,11.
                   4.5        p261: 1,5,7,9,17,23,25,34.
Nov 22        4.6        p271: 1,5,8,9,15.
                   7.1        p429: 7,9,11,13.
Nov 29        7.2        p437: 1,2,9,11,15,17,21.
                   7.3        p447: 1,2,3,5,11,14.
Dec 6          7.4        p457: 1,2,5,7,9,12.
                   7.5        p467: 1,4.
                  Review
 
Quizzes:  During the semester there will be 10 unannounced quizzes (10-15 min each) from the sections covered in class.  They will contain exercises from, or similar to the ones on the list above. Their scores will count towards the final grade.

Assessment:  Your final grade will be computed based on the follwing scheme.
                        15 % Quizzes
                        20 % Exam 1
                        20 % Exam 2 
                        20 % Exam 3
                        25 % Final Exam

Course Policy:  Class attendance is expected. If you miss a class it is your responsibility to get
the material from your colleagues.
Make-up exams or quizzes will be administered only in extreme cases. Cheating will be penalized by at best giving a lower letter for the course grade.


           If you have any questions or suggestions, please feel free to bring them up!
 
Practice problems for exam #2
Solutions to practice problems for exam #2
Formula sheet for exam #2
Practice problems for exam #2 (ps file)
Practice problems for exam #2 (pdf file)


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