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Projection Operator

p^~=|phi_i(x)><phi_i(t)|
(1)
p^~sum_(j)c_j|phi_j(t)>=c_i|phi_i(x)>
(2)
sum_(i)|phi_i(x)><phi_i(x)|=1.
(3)

See also

Bra, Ket, Projection, Projection Matrix

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Cite this as:

Weisstein, Eric W. "Projection Operator." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ProjectionOperator.html

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