Phase Transitions Period: 2022-2024. Mission: Assistant teacher of Guilhem Semerjian. Level: Master 1. University: École Normale Supérieure, PSL Université. Number Subject Exercises Solutions TD1 The Curie-Weiss Model TD2 Unidimensional Models TD3 The Critical Temperature of the Ising Model in 2D TD4 Correlation Inequalities TD5 Real Space Renormalisation Group TD6 Scaling Functions and Relationships between Critical Exponents TD7 Mermin-Wagner Theorem and Vortices TD8 DNA Elasticity and Polymer Models