The Langlands Program.Periods, L-functions, and the relative trace formula : 3 / Summer School on the Langlands Program, July 11–29, 2022, Institut des hautes études scientifiques, Bures-sur-Yvette, France ; Pierre-Henri Chaudouard, Wee Teck Gan, Tasho Kaletha, Yiannis Sakellaridis, editors. Providence, Rhode Island : American Mathematical Society, 2025