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:* it is '''not''' said (and should be said) that this means that the function is *piecewise affine*
:* it is '''not''' said (and should be said) that the function is (a priori) *nowhere* a linear function (not even piecewise, i.e., on some subinterval), and none of the affine functions to which it may be equal on some interval, is linear in the sense of the definition [need it to be said? is there another sense?] of what means for a function to be linear. — [[User:MFH|MFH]]:[[User talk:MFH|Talk]] 23:38, 1 December 2022 (UTC)
:PS: I have just created the redirect [[Piecewise affine function]]. At least that... 15 years later...
== Square wave ==
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