TY - RPRT TI - Time-step restrictions for numerical approximations of the Poisson-Nernst-Planck (PNP) equations AU - Jaeger, K. H. AU - Tveito, A. PY - 2026 DO - 10.64898/2026.04.30.721819 UR - https://www.biorxiv.org/content/10.64898/2026.04.30.721819v1 ID - 10.64898/2026.04.30.721819 ER -