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This volume contains the lecture notes of the Third JETSET School on Jets from Young Stars focussing on Numerical MHD and Instabilities. The introductory lectures presented here cover the basic concepts of the numerical methods for the integration of hydrodynamic and magnetohydrodynamic equations and of the applications of these methods to the treatment of the instabilities relevant for the physics of stellar jets. The first part of the book contains an introduction to the finite difference and finite volume methods for computing the solutions of hyperbolic partial differential equations and a discussion of approximate Riemann solvers for both hydrodynamic and magnetohydrodynamic problems. The second part is devoted to the discussion of some of the main instability processes that may take place in stellar jets, namely: the Kelvin-Helmholtz, the radiative shock, the pressure driven and the thermal instabilities. Graduate students and young scientists will benefit from this book by learning how to use the fundamental tools used in computational astrophysical jet research.

Astrophysical jets --- Magnetization instabilities --- Stellar dynamics --- Mathematical models --- Dynamics, Stellar --- Stars --- Celestial mechanics --- Astrophysics --- Jets --- Radio sources (Astronomy) --- Dynamics --- Astrophysics and Astroparticles. --- Numerical and Computational Physics, Simulation. --- Astrophysics. --- Physics. --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics --- Magnetohydrodynamic instabilities --- Hydromagnetic instabilities --- Instabilities, Magnetohydrodynamic --- MHD instabilities --- Magnetohydrodynamics --- Plasma instabilities