Directional derivative Definition and 101 Threads
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Undergrad Is the Use of h Confusing in the Directional Derivative Proof?
Im reading over about the directional derivative. Stewart, page 800 says: "Proof: If we define a function g of the single variable h by g(h) = f(x_0 + ha, y_0 + hb) then by the definition of a derivative we have g'(0)= lim_{h \rightarrow 0} \frac{g(h) - g(0)}{h} = lim_{h...