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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
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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
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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
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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
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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
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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
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What is a Differential Equation - YouTube
What a differential equation is and some terminology.
https://www.youtube.com/watch?v=-_POEWfygmU
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Ordinary Differential Equation
Ordinary Differential Equation - from Wolfram Math World.
http://mathworld.wolfram.com/OrdinaryDifferentialEquation.html
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Differential Equation - Wikipedia
A differential equation is a mathematical equation that relates some function with its derivatives.
https://en.wikipedia.org/wiki/Differential_equation
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Differential Equations - Khan Academy
Differential equations, Separable equations, exact equations, integrating factors and Homogeneous equation information.
https://www.khanacademy.org/math/differential-equations