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Psi (letter)
From Wikipedia, the free encyclopedia
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Difraktsioon
(Helmholtzi võrrand), ∇ 2 ψ + k 2 ψ = δ ( r ) {\displaystyle \nabla ^{2}\
psi
+k^{2}\
psi
=\delta (\mathbf {r} )} Kus δ ( r ) {\displaystyle \delta (\mathbf {r}