Electron liquids in solids: hydrodynamic description inspired by ideas of Radii Gurzhi

This is the preface article written for the special issue of Low Temperature Physics on the captivating topic of electron hydrodynamics dedicated to the pioneering work of Radii Gurzhi. The article features a brief synopsis of Gurzhi’s seminal contributions that have played a pivotal role in shaping this continuously evolving area of condensed matter physics. This tribute is followed by a brief introduction to the collection of contributed papers published in the issue representing recent research in this dynamic field.