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Functionals and the Functional Derivative
tives. This is achieved by a suitable de nition. The de nition of the functional derivative (also called variational derivative) is dF [f + ] d =0 =: dx 1 F [f] f(x 1) (x 1) . (A.15) This de nition implies that the left-hand side can be brought into the form on the right-hand side, i.e. the form of a linear functional with kernel F [f]/ f acting on
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