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## wiggles

**wiggles** /n./ [scientific computation] In solving partial
differential equations by finite difference and similar methods,
wiggles are sawtooth (up-down-up-down) oscillations at the shortest
wavelength representable on the grid. If an algorithm is unstable,
this is often the most unstable waveform, so it grows to dominate
the solution. Alternatively, stable (though inaccurate) wiggles
can be generated near a discontinuity by a Gibbs phenomenon.

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