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• 15:39, 28 April 2022 0kelvin talk contribs created page A sufficient condition for differentiability for many variables (Created page with "From a graphical perspective, when the derivative of a single variable function is continuous at a point, we can safely assume that the function is differentiable there. This is a mathematical way of defining the "smoothness" of a function. The same concept can be extended to multivariable functions. If the partial derivatives are continuous, the function is differentiable. This theory is a shortcut, a tool, to be used when we want to find whether a function is different...")