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Equation Icon  ∂2 2l ∂ 2E ∕(2m ω2) − p2∕(m ω)2 ---ψ (p) + ----P2l-----Ψ (p) + -----------2-----------ψ (p) = 0. (216 ) ∂p2 1 + lPlp2 ∂p (1 + lPlp2)2