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Reference.org
Piecewise linear function
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a piecewise linear or segmented function is a <a href="/facts/Real-valued_function/jetqlJpK">real-valued function</a> of a real variable, whose <a href="/facts/Graph_of_a_function/htYX0BGX">graph</a> is composed of straight-<a href="/facts/Line_segment/V8E0M4qk">line segments</a>. </p>