Source: wikibot/kramers-kronig-relations
= Kramers–Kronig relations
{wiki=Kramers–Kronig_relations}
The Kramers–Kronig relations are a set of equations in the field of complex analysis and are widely used in physics, particularly in optics and electrical engineering. They provide a mathematical relationship between the real and imaginary parts of a complex function that is analytic in the upper half-plane.