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This applet allows one to change the frequency of two waves between 5 and 20 Hz with a slider scale as well as classify the waves as in or out of phase. You obtain the wave motion over time.

This site contains notes for a variety of elementary differential equations topics.Â  Headings of major sectionsÂ include: first order, second order (including series solutions
This webpage displays fully-worked examples showing the solution of a first-order linear inhomogeneous differential equation with constant coefficients.
This webpage displays fully-worked examples showing the solution of a first-order Bernoulli differential equation with constant coefficients.
This Mathematica Demonstration considers a single initial value problem for a single Cauchy-Euler equation.
A Java applet that allows one to interactively analyze (graphically) second order differential equations.
One-page introduction into Laplace Transforms with text references
This is the homepage for a collection of graphers written in Java.
This applet provides an interface for displaying the slope field associated with a first-order DE $x'=f(t,x)$. There is a nice collection of built-in problems, or you can enter your own.
This webpage displays fully-worked examples showing the solution of an initial value problem for a first-order linear ODE.