Chiral Perturbation Theory – Lectures by Oliver Bär Lecture 1 (Oct. 9, 2020) pdf lectures video recordings Lecture 2 (Oct. 16, 2020) pdf Lecture 3 (Oct. 23, 2020) pdf Lecture 4 (Oct. 30, 2020) pdf Exercises of Lecture 1, 2, 3, 4