Piecewise linear manifold, a topological space formed by gluing together flat spaces
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Piecewise linear continuation, a method for approximating functions by piecewise linear functions
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Piecewise linear function, a function whose domain can be decomposed into pieces on which the function is linear
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In the Summer of 1953 Fermi, Pasta, Ulam and Mary Tsingou conducted numerical experiments (i.e. computer simulations) of a vibrating string that included a non-linear term (quadratic in one test, cubic in another, and a piecewise linear approximation to a cubic in a third).