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Consider a functional, what is meant by a minimal sequence consistent of 'piecewise affine functions'?

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    $f$ is *affine* function, if $x\mapsto f(x)-f(0)$ is linear.2012-11-02
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    Could you give some context?2012-11-02
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    I want to show that an minimum of an energy-functional does not exist.2012-11-02
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    Is arctan an affine function?2012-11-02
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    @AlexisZorbas Affine functions are those of the form $f(x)=ax+b$ for some constants $a$ and $b$. Of course, $\arctan$ is not of that form.2015-06-12

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