This textbook is for undergraduate students on a basic course in
Statistical Mechanics. The prerequisite is thermodynamics. It begins
with a study of three situations -- the closed system and the systems in
thermal contact with a reservoir -- in order to formulate the important
fundamentals: entropy from Boltzmann formula, partition function and
grand partition function. Through the presentation of quantum
statistics, Bose statistics and Fermi-Dirac statistics are established,
including as a special case the classical situation of Maxell-Boltzmann
statistics. A series of examples ensue it: the harmonic oscillator, the
polymer chain, the two level system, bosons (photons, phonons, and the
Bose-Einstein condensation) and fermions (electrons in metals and in
semiconductors). A compact historical note on influential scientists
forms the concluding chapter.The unique presentation starts off with the
principles, elucidating the well-developed theory, and only thereafter
the application of theory. Calculations on the main steps are detailed,
leaving behind minimal gap. The author emphasizes with theory the link
between the macroscopic world (thermodynamics) and the microscopic
world.