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• 13:12, 19 January 2022 0kelvin talk contribs created page Mistakes regarding functions (Created page with "* **Concerning confusion between single variable and multivariable functions** * I have no idea if this mistake happens, but it's a possibility nonetheless. Suppose that we have $f(x,y) = x + y$. It's possible that one makes the conceptual mistake to consider it as a sum of $f(x) + f(y)$. A function can have one or as many variables as we want to or need to. However, to sum functions of different variables is a meaningless operation. Suppose one function represe...")