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I have a physics article who solve Poisson equation of the form:

L^{2}∂^{2}f/∂x^{2}=sinh(f)

The proposed solution is:

tanh(f/4)=exp(x/L) tanh(f0/4)

with f0 a constant

I suspect an error, something like a forgotten factor.

How can I verify? (I tried but I failed)

I forgot the limit conditions:

x belong to [-∞,0] and f and its first dérivative are null at -∞

Thanks

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# I Solution of Ld2f/dx2=sinh(f)

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