MATH 246 - Dr. Wolfe 
Review
List For Exam #3 (November 28, 2007)
The Exam will cover material in Text: Sections 6.1-6.5,  
7.1,  7.4-7.6,  7.8  and 9.1. 
Chapter 6 
 Concepts: 
 
 - Laplace Transform
- Theorem 6.2.1 and corollary 6.2.2 
-  Step Function 
-  Theorem 6.3.1 
-  Dirac Delta Function 
Problems: -  p.312 Ex. 5(a),(b);  p.322, Ex 11;  p.330, Ex 9;
  P337, Ex 1. 
Chapter 7
Concepts:
-  Systems of First Order Linear Equations.
- Transforming a second order equation into a system of two
     first order equations. 
-  Fundamental set of solutions of a homogeneous system.
-  Finding eigenvalues and eigenvectors of a 2 × 2 matrix. 
-  Fundamental set of solutions in the case of real distinct eigenvlues. 
-  Fundadental set of solutions in the case of complex eigenvalues 
-  Fundamental set of solutions in the case of a repeated eigenvalue. 
Problems:-  p.360, Ex. 5;   p.398, Ex.1;   p.410, Ex. 1;
       p.428, Ex.1.  
Section 9.1Concepts: 
 
-  Phase plane 
-  Node 
-  Saddle point 
-  Spiral point 
-  Center 
-  Stability of the origin 
Problems:-  p.492, Ex. 2, 4, 5 (parts (a), (b), and (c) only).