Projection (algebra linear)

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In algebra linear e analyse functional, un projection es un transformation linear P de un spatio de vectores a ipse tal que P2 = P.

Le equation de autovalores (eigenvalue)

A|n>=a_n |n>

defini

P_n = |n><n| ,
A=\sum_n a_n P_n = \sum_n a_n |n><n|.
I=\sum_n  P_n = \sum_n  |n><n|.
Pecietta