Note that, unless otherwise specified,
all exercises are from Boyce and DiPrima, Elementary Differential
Equations and Boundary Value Problems, sixth edition.
Exercise 9a - Due Friday, May 28
- Section 10.1 # 9
- Section 10.2 # 13, 14, 18, 28
Exercises 8b - Due Monday, May 24
- Section 9.3 # 5, 6
- Section 9.4 # 8, 9
- Find the fixed points of the following system, classify them, sketch
the neighbouring trajectories, and fill in the rest of the phase portrait.
- dx/dt = x-y, dy/dt = x^2 -4
Exercise 8a - Due Friday, May 21
- Section 9.1 # 2ab, 5ab, 8ab
- Section 9.2 # 5ac, 6ac, 9ac, 19
Exercise 7b - Due Monday, May 17
- Section 7.5 # 7, 16
- Section 7.6 # 2, 6, 13
- Section 7.7 # [optional 7]
Exercise 7a - Due Friday, May 14
- Section 7.1 # 21
- Section 7.3 # 15, 16, 18
- Section 7.5 # 1, 4, 5
Exercise 6b - Due Monday, May 10
- Section 6.6 # 1, 6, 10, 12, 16, 18
- Section 7.1 # 1, 3, 4, 10
Exercise 6a - Due Friday, May 7
- Section 6.3 # 9, 10, 13, 16
- Section 6.4 # 5, 9, 12
- Section 6.5 # 3, 6, 12
Exercise 5b - Due Monday, May 3
- Section 6.1, Exercises 6, 7, 26, 27.
- Section 6.2, Exercise 16, 17, [optional 28], 30.
Exercise R1 - Review (will not be graded)
- Section 2.5 Exercise 26
- Section 2.10 Exercise 2,8,10,15,43
- Section 3.5 Exercise 7,27
- Section 3.6 Exercise 6,7,17
- Section 5.2 Exercise 2
Exercise 4b - Due Monday, April 26
- Section 3.7, Exercises 31, 32.
- Section 5.2, Exercise 12.
- Section 5.3, Exercises 6, 11, 18.
Exercise 4a - Due Friday, April 23
- Section 3.6, Exercise 31, 32.
- y1 = x-1/2 cos(x) is one solution of the Bessel equation
x2 y'' + x y' + (x2 - 1/4) y = 0
Use reduction of order to find the general solution.
- Find the general solution of
x2 y'' + 2x(1-3x) y' + (9x2 - 6x -2) y =0
using reduction of order, given that y1 = x e3x is a solution.
- Read Section 5.1 of Elementary D.E.s and B.V.Ps.
- Section 5.2, Exercises 1, 7.
Exercise 3b - Due Monday, April 19
- Section 3.4, Exercise 40.
- Section 3.5, Exercises 6, 13, 41.
- Section 3.6, Exercises 8, 9, 10, 15.
Exercise 3a - Due Friday, April 16
- Section 3.1, Exercises 3, 9, 23.
- Section 3.1, Exercises 31, 36, 40.
- Section 3.4, Exercises 3, 6, 10, 14, 22.
Exercise 2b - Due Monday, April 12
- Section 2.8, Exercises 18, 21.
- Section 2.8, Exercises 26, 27.
- Section 2.9, Exercises 4, 5, 15.
- Section 2.9, Exercise 38.
Exercise 2a - Due Friday, April 9
- Section 2.1, Exercises 13,14,28
- Section 2.1, Exercises 29,31
- Section 2.8, Exercises 3,4,8
- (Hard) Show that the differential equation
is not exact, and that the differential equation
is exact. Explain why this is possible.
Exercise 1b - Due Monday, April 5
- Section 2.4, Exercise 17.
Section 2.5, Exercise 17.
- Section 2.6, Exercises 1, 3, 10, 21.
For the next two problems, refer to the graphs on the printed handout.
- Describe the long term behavior of the solutions of y' = f(y),
where f(y) is the function illustrated.
- Find an equation whose solutions have the behavior illustrated.
Exercise 1a - Due Friday, April 2
- Read Chapter 1 of Elementary D.E.s and B.V.Ps.
- Section 2.3, Exercises 1, 3, 5, 9, 17.
- Section 2.5, Exercises 6, 21, 27.