Talk:Local linearity

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The current text claims that there is no non-visual definition of Local Linearity, but my calc text (Varberg, Purcell, and Rigdon) has a more rigorous definition. I'm hesitant to edit the page, because I am just reaching this section in my studies (not very knowledgeable in the subject), and I don't know how to code math symbols for wiki pages. I just thought it was interesting and probably incorrect that the page claims "there is no other definition".