Eigenfunction Estimates: Quantitative bounds and asymptotic behaviours that describe the magnitude and concentration phenomena of eigenfunctions of differential operators.

Reviews ordinary differential equations, including solutions by Fourier series. Physical derivation of the classical linear partial differential equations (heat, wave, and Laplace equations). Solution ...

Abdumalik Rakhimov, Erkin Saydamatov, Shuhrat Sheraliev, On the Riesz Summability of the Eigenfunction Expansions on a Closed Domain, Filomat, Vol. 33, No. 16 (2019), pp. 5199-5205 ...