**Differential Equations - Introduction**
https://www.mathsisfun.com/calculus/differential-equations.html

Differential Equations can describe how populations change, how heat moves, how springs vibrate, how radioactive material decays and much more. They are a very natural way to describe many things in the universe. What To Do With Them? On its own, a Differential Equation is a wonderful way to express something, but is hard to use.. So we try to solve them by turning …

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