Friedel's law
（重定向自Friedel Law）
Friedel's law, named after Georges Friedel, is a property of Fourier transforms of real functions.
Given a real function ![f(x)](/Images/godic/202501/14/50bbd36e1fd2333108437a2ca378be625734.png")
, its Fourier transform
has the following properties.
where ![F^*](/Images/godic/202501/14/311568fc471ef84dc10567a48a1703785734.png")
is the complex conjugate of ![F](/Images/godic/202501/14/800618943025315f869e4e1f094710125734.png")
.
Centrosymmetric points ![(k,-k)](/Images/godic/202501/14/8b201e36ff4749a062e8f20c4e0c60d95734.png")
are called Friedel's pairs.