Friedel's law, named after Georges Friedel, is a property of Fourier transforms of real functions.
, its Fourier transform has the following properties.
are called Friedel's pairs.
is antisymmetric: Friedel's law is used in X-ray diffraction, crystallography and scattering from real potential within the Born approximation.
Opération de maclage) is equivalent to an inversion centre and the intensities from the individuals are equivalent under Friedel's law.
This crystallography-related article is a stub.