Math 6307 Ordinary differential Equations I. Fall 2017
Schedule: 1:30  2:45
pm TR

Classroom: Skiles 257

Office: Skiles 102A

Phone: 4048944750

Email:
zengch@math.gatech.edu

Webpage: www.math.gatech.edu/~zengch

Office hours: 1:30  3 pm M & 4:05  4:40 pm T


Syllabus
Instructor: Chongchun
Zeng
Prerequisites: MATH 2552&4541, or permission of the instructor
Participation: Attendence
in
classes is mandatory. Students are expected to read the materials
before and/or
after the classes. It is suggested that you start to work on
homework
problems right after they are assigned.
Main reference book: Ordinary differential equations with
applications, Carmen Chicone, 2nd edition, Springer. (Homework will mainly
come from
this book.)
Materials: In this semester, we will develop the qualitative
theory for systems of ordinary differential equations. Subjects will are rough limit sets, stability,
Lyapunov functions,
linear systems, Floquet theory, attractors, invariant manifolds,
bifurcation theory, normal forms, periodic orbits. The topics are among
 General properties: existence, uniqueness, continuous dependence, stability, Lyapunov
functions, limit sets, PoincareBendixson theorem
 Linear Systems:
constant coefficient systems, periodic systems, nonhomogeneous systems,
Fredholm alternative, Hamiltonian systems, mappings
 Local theory near equilibria: HartmanGrobman theorem, stable and unstable manifolds,
foliations, center manifolds, elementary bifurcations and the Hopf bifurcation
 Periodic orbits:
Poincare map, persistence, Hamiltonian systems.
Grades:
 1 takehome final exam 40%: `opentextbook' and `opennotes', must be entirely
independent
work.
 4 homework, 15% each: homework will be assigned at the end of
each lecture and then put on this webpage in the below. You may discuss
the homework problems with other students in this class, but you should write down the solutions and complete the homework independently.
On each collecting day, the homework is due in the classroom at the
beginning of the lecture. The corresponding assignment includes all the
problems assigned in previous weeks, but after the last assignment.
Some selected problems from each assignment will be graded and the
score will be given based on both the graded problems and the
completion of the whole assignment. The exact homework collecting dates
are:
9/7(Thu.), 9/28(Thu.), 10/19(Thu.), 11/9(Thu.)
Homework assignments:
 Homework Assignment #1 (due Thu. 9/7):
 Assigned on Tue. 8/22: Page 4., 1.6 (aacde); Page 5., 1.10
 Assigned on Thu. 8/24: Attachment
 Assigned on Tue. 8/31: Page 5., 1.8; Page 11., 1.13
 Homework Assignment #2 (due Thu. 9/28):
 Homework Assignment #3 (due Thu. 10/19):
 Assigned on Tue. 9/26: Page 32, 1.61(2, 5), 1.62(4, 6)
 Assigned on Thu. 9/28: Page 99, 1.182; Page 100, 1.184
 Assigned on Tue. 10/3: Page 100, 1.186
 Assigned on Thu. 10/5: Page 158, 2.25(1,4), 2.30(optional)
 Sketch of the solutions to some graded problems
 Homework Assignment #4 (due Thu. 11/9):
 Assigned on Thu. 10/12: Page 153, 2.19(optional); Page 158, 2.26, 2.27
 Assigned
on Tue. 10/17: Page 153, 2.20; Page 159, 2.29,
2.30(optional); Page 163, 2.34(optional); Page
169, 2.45
 Assigned on Thu. 10/19: Page 163, 2.34(a) (optional); Page 167, 2.43
 Assigned on Tue. 10/24: Page 193, 2.85, 2.86 (optional), 2.87 (optional)
 Assigned on Thu. 10/26: none.
 Assigned on Tue. 10/31: Page 197, 2.93(optional)
 Sketch of the solutions to some graded problems
 Homework recommedned but not collected and not counted towards the final score:
 Assigned on Tue. 11/7: Page 358., 4.10
 Assigned on Thu. 11/16: Page 347., 4.4