Geodesic
On the convergence of the formal Fourier solution of the wave equation with a summable potential
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 56 (2016) no. 10, pp. 1795-1809 
A. P. Khromov. On the convergence of the formal Fourier solution of the wave equation with a summable potential. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 56 (2016) no. 10, pp. 1795-1809. http://geodesic.mathdoc.fr/item/ZVMMF_2016_56_10_a10/
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     title = {On the convergence of the formal {Fourier} solution of the wave equation with a summable potential},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The convergence of the formal Fourier solution to a mixed problem for the wave equation with a summable potential is analyzed under weaker assumptions imposed on the initial position $u(x,0)=\varphi(x)$ than those required for a classical solution up to the case $\varphi(x)\in L_p[0,1]$ for $p>1$. It is shown that the formal solution series always converges and represents a weak solution of the mixed problem.

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