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NEED PROOF READING
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Math example :
( − ℏ 2 2 m ∇ + V ( r ) ) ϕ = ∂ ∂ t ϕ {\displaystyle \left(-{\frac {\hbar ^{2}}{2m}}\nabla +V(r)\right)\phi ={\frac {\partial }{\partial t}}\phi }
