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  • $\begingroup$ Hi Roman, thank you for the answer. I have tried to apply your suggestion to the following Assuming[F > 0, AsymptoticSolve[F == Sqrt[p^2 + ma^2]+Sqrt[p^2+mb^2] + (e d1[p])/r + (e^2 d2[p])/r^2, {p, Sol1[p]}, {e, 0, 2}] // FullSimplify], being Sol1[p] the positive root for F==Sqrt[p^2 + ma^2]+Sqrt[p^2+mb^2]. Unfortunately it doesn't solve it, is it normal? $\endgroup$ Commented Jun 2, 2019 at 9:53
  • $\begingroup$ There is a tipo: Only d1[p] is used in the equation! $\endgroup$ Commented Jun 2, 2019 at 9:57
  • $\begingroup$ I saw it, indeed I am worried that by using different d1, d2, mathematica just can't make it in solving everything in a reasonable amount of time. Could it be? $\endgroup$ Commented Jun 2, 2019 at 9:58
  • $\begingroup$ @Andrea.Phys maybe add some more assumptions? I think this should work in principle. Keep in mind that AsymptoticSolve is an experimental function and may have unexpected trouble. I'm away from the computer and cannot try, the weather is splendid in Europe! $\endgroup$ Commented Jun 2, 2019 at 10:29
  • $\begingroup$ @UlrichNeumann thanks, I'll correct it when I get to it. $\endgroup$ Commented Jun 2, 2019 at 10:30