Expansion Postulate -- from Eric Weisstein's World of Physics

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Modern Physics "> Quantum Physics "> Quantum Mechanics "> General Quantum Mechanics v

Expansion Postulate

A normalized wavefunction may be expanded in a set of orthonormal basis functions , known as eigenfunctions. Using Einstein summation Eric Weisstein's World of Math,

(1)

or, in Dirac notation, Eric Weisstein's World of Math

(2)

where is a ket. Eric Weisstein's World of Math