This video explains what a total differential is.
It uses simple examples of a price function to show how to calculate it and what it means.
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Note on notation: In some books, the partial derivative is represented with a "round delta" δ:
dP = δP/δx * dx + δP/δy * dy.
The round delta is just to emphasize that this is a partial derivative at this point, i.e., when the derivative is x, the y is considered a constant and vice versa.
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