So I've been reading David Bohm's original paper on the alternative interpretation of quantum mechanics in terms of hidden variables, just out of interest. In the 4th section he presents a complex function(adsbygoogle = window.adsbygoogle || []).push({}); ψin terms of R and S, and then (using the time dependent schrodinger equation, TISE) gives the partial derivatives of R and S with respect to time. My problem is I can't seem to work out how he did it. The thing I did was to use the chain rule and to take the derivative ofψwith respect to R and S, and then multiply those with the derivatives of R and S with respect to time, respectively. However, from there I got lost because after plugging these back into the TISE, I couldn't seem to simplify the relation to resemble the one in the paper, perhaps there is some laplacian identity that i'm unaware of, or some algebraic manipulation that I can't see. Can anyone help me out??

(I have linked the original paper to this post for reference, page 4 is what my question is on.)

http://fma.if.usp.br/~amsilva/Artigos/p166_1.pdf

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# A David Bohm's Paper on Hidden Variables Theory

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