Frechet/functional derivative - misunderstanding

  1. Hi people,

    I have some confustion in understanding the frechet/functional derivative.

    If we have a function like this: -

    F(x)= ∫x(r')G(r',r)dr' the integration over Si (2D domain) , G is a 2D green function, r is a 2D vector outside Si, r' is a 2D vector inside Si

    if I want to take the derivative δF(x)/δx at some point x=xi what should I have?

    According to a book I have it becomes
    F(x)= ∫xi(r')G(r',r)dr'

    But I don't see the reason?
  2. jcsd
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