2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77773The endpoint Strichartz estimates for the Schrödinger equation are known to be false in two dimensions. However, if one averages the solution in $L^2$ in the angular variable, we show that the homogeneous endpoint and the retarded half-endpoint estimates hold, but the full retarded endpoint fails. In particular, the original versions of these estimates hold for radial data.8 pages, minor typos correctedAnalysis of PDEs35J10text