- 	
					                 		        				  								  
					 			      	Differential Equation - Britannica
					 			      	 
 Mathematical statement containing one or more derivatives -that is, terms representing the rates of change of continuously varying quantities. http://www.britannica.com/topic/differential-equation
- 	
					                 		        				  								  
					 			      	Stiff Differential Equations - Math Works
					 			      	 
 Stiffness is a subtle, difficult, and important - concept in the numerical solution of ordinary differential equations. http://www.mathworks.com/company/newsletters/articles/stiff-differential-equations.html
- 	
					                 		        				  								  
					 			      	Differential Equations For Dummies Cheat Sheet
					 			      	 
 The most common classification of differential equations is based on order. The order of a differential equation simply is the order of its highest derivative. You can have first-, second-, and higher-order differential equations. http://www.dummies.com/how-to/content/differential-equations-for-dummies-cheat-sheet.html
- 	
					                 		        				  								  
					 			      	Differential Equations - Introduction
					 			      	 
 Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents. https://www.mathsisfun.com/calculus/differential-equations.html
- 	
					                 		        				  								  
					 			      	An Introduction to Ordinary Differential Equations - Math In Sight
					 			      	 
 An introduction using simple examples explaining what an ordinary differential equation is and how one might solve them. http://mathinsight.org/ordinary_differential_equation_introduction
- 	
					                 		        				  								  
					 			      	Differential Equation Introduction - Khan Academy
					 			      	 
 A video from Khan Academy that shows the differential equation. https://www.khanacademy.org/math/differential-equations/first-order-differential-equations/differential-equations-intro/v/differential-equation-introduction
- 	
					                 		        				  								  
					 			      	What is a Differential Equation - YouTube
					 			      	 
 What a differential equation is and some terminology. https://www.youtube.com/watch?v=-_POEWfygmU
- 	
					                 		        				  								  
					 			      	Ordinary Differential Equation
					 			      	 
 Ordinary Differential Equation - from Wolfram Math World. http://mathworld.wolfram.com/OrdinaryDifferentialEquation.html
- 	
					                 		        				  								  
					 			      	Differential Equation - Wikipedia
					 			      	 
 A differential equation is a mathematical equation that relates some function with its derivatives. https://en.wikipedia.org/wiki/Differential_equation
- 	
					                 		        				  								  
					 			      	Differential Equations - Khan Academy
					 			      	 
 Differential equations, Separable equations, exact equations, integrating factors and Homogeneous equation information. https://www.khanacademy.org/math/differential-equations