This book covers a wide range of topics on the interaction of alternating magnetic field with condensed matter, including superradiant process, proton echo, gamma resonance, scattering of light by condensed matter near critical points, electromagnetically induced phase transitions and some mathematical problems describing the phenomena mentioned.Contents:Algebraic Methods in the Theory of the Interaction of Radiation with Matter (V P Karassiov et al.)Functional Methods in Quantum Optics (V N Popov & V S Yarunin)Theory of Collective Raman Scattering in Intense Laser Field (A S Shumovsky & T Quang)Polarization Echo Spectroscopy (I V Yevseyev & V M Yermachenko)Short-wave Stimulated Coherent Emission (V I Yukalov)Optical Superradiance in Mixed Molecular Crystals (P V Zinoviev et al.)and other papersReadership: Condensed matter physicists.Key Features:A unified presentation of statistical thermodynamics based on the concept of information instead of entropyA novel and original analysis of some elementary processes that leads to counter-intuitive conclusionsAccessible to any student of chemistry or physics as well as to any researcher in scienceA deep and profound analysis of seemingly simple processes based on informational changesIncludes a novel analysis of the concepts of identity and ID of molecular particles