CONTENTS I. Introduction 1 II. Wet and dry models: The role of the solvent in active matter 1 III. Dry active particles: The active Brownian particle model and its alternatives 2 IV. Continuum theories for dry active matter 7 V. Hydrodynamics of microswimming: Low Reynolds number and Stokes flow 10 VI. Modeling hydrodynamics at the many-particle level 11 VII. Continuum theories of microswimmers with hydrodynamic interactions 13 References 14
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