Error analysis of Fourier–Legendre and Fourier–Hermite spectral-Galerkin methods for the Vlasov–Poisson systemXiaolong Zhang, Li-Lian Wang and Hongli JiaESAIM: M2AN, 57 6 (2023) 3637-3668DOI: https://doi.org/10.1051/m2an/2023091