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I want to solve a transcendental equation analytically, the equation basically is

Solve[-2.50663 gs gv ((kb mc T)/h^2)^0.5 PolyLog[1/2, -E^y] == 
  1.25331 gs gv ((kb mc T)/
    h^2)^0.5 (-PolyLog[1/2, -E^x] - PolyLog[1/2, -E^(-vd + x)]), y]

I want to solve for y and get it in terms of the other variables. I can't plot and find the solution since I am looking for analytical answer. What is the best way to do so?

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  • $\begingroup$ Reduce is sometimes more powerful than Solve for non-polynomial problems. If we assume a few things about your problem then your problem "simplifies" down to Reduce[PolyLog[1/2,-E^y]==c,y] for a complicated expression c, but it replies "This system cannot be solved with the methods available to Reduce". $\endgroup$ – Bill Apr 28 at 17:00
  • $\begingroup$ @Bill then how should I go about next? $\endgroup$ – Indeterminate Apr 28 at 17:33
  • $\begingroup$ Look into the literature on PolyLog and see if there are any known inverses. Since Plot[PolyLog[1/2,-E^y],{y,-10,10}] looks nice and simple and Real then could you possibly express this as an infinite series and get a solution that way? Ask very bright and experienced mathematicians if they are aware of any ways to get analytical solutions to your problem. I know of nothing else. $\endgroup$ – Bill Apr 28 at 19:25

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