Geometric Methods in PDE's

1 On Friedrichs commutators lemma for Hardy spaces and applications. Jorge Hounie.- 2 On the Hardy constant of some non-convex planar domains. Gerassimos Barbatis and Achilles Tertikas.- 3 Sharp singular Trudinger-Moser-Adams type inequalities with exact growth. Nguyen Lam and Guozhen Lu. 4 A Quantitative Lusin Theorem for Functions in BV. András Telcs and Vincenzo Vespri.- 5 X-Elliptic Harmonic Maps. Sorin Dragomir.- 6 Sum operators and Fefferman - Phong inequalities. Giuseppe Di Fazio, Maria Stella Fanciullo, Pietro Zamboni.- 7 Lp-parabolic regularity and non-degenerate Ornstein-Uhlenbeck type Operators. Enrico Priola.- 8 Local solvability of nonsmooth Hörmander's operators. Marco Bramanti.- 9 Multiple solutions for an eigenvalue problem involving non-local elliptic p-Laplacian operators. Patrizia Pucci and Sara Saldi.- 10 Uniqueness of solutions of a class of quasilinear subelliptic equations. Lorenzo D'Ambrosio and Enzo Mitidieri.- 11 Liouville type theorems for non-linear differential inequalities on Carnot groups. Luca Brandolini and Marco Magliaro.- 12 Modica type gradient estimates for reaction-diffusion equations. Agnid Banerjee and Nicola Garofalo.- 13 A few recent results on fully nonlinear pde's. Italo Capuzzo Dolcetta.- 14 Hölder regularity of the gradient for solutions of fully nonlinear equations with sub linear first order term. Isabeau Birindelli and Francoise Demengel.- 15 The Reflector Problem and the inverse square law. Cristian E. Gutiérrez and Ahmad Sabra.- 16 Gagliardo-Nirenberg inequalities for horizontal vector fields in the Engel group and in the 7-dimensional quaternionic Heisenberg group. Annalisa Baldi, Bruno Franchi and Francesca Tripaldi.- 17 Regularity of the free boundary in problems with distributed sources. Daniela De Silva, Fausto Ferrari, Sandro Salsa.- 18 The role of fundamental solution in Potential and Regularity Theory for subelliptic PDE. Andrea Bonfiglioli, Giovanna Citti, Giovanni Cupini, MariaManfredini, Annamaria