This section of the book "Ramanujan’s Notebooks, Part IV" provides an overview of the content and structure of the fourth volume in a series dedicated to editing Srinivasa Ramanujan's notebooks. The notebooks, recorded between 1903 and 1914, contain Ramanujan's mathematical discoveries without proofs. The book is part of a five-volume series, with this volume focusing on proving the results found in the unorganized portions of the second and third notebooks. It also includes proofs for results in the first notebook that are not found in the second or third notebooks. The content covers various mathematical topics such as elementary results, number theory, prime numbers, theta-functions, modular equations, q-series, integrals, special functions, and partial fraction expansions. The book is authored by Bruce C. Berndt and is published by Springer Science+Business Media, LLC.This section of the book "Ramanujan’s Notebooks, Part IV" provides an overview of the content and structure of the fourth volume in a series dedicated to editing Srinivasa Ramanujan's notebooks. The notebooks, recorded between 1903 and 1914, contain Ramanujan's mathematical discoveries without proofs. The book is part of a five-volume series, with this volume focusing on proving the results found in the unorganized portions of the second and third notebooks. It also includes proofs for results in the first notebook that are not found in the second or third notebooks. The content covers various mathematical topics such as elementary results, number theory, prime numbers, theta-functions, modular equations, q-series, integrals, special functions, and partial fraction expansions. The book is authored by Bruce C. Berndt and is published by Springer Science+Business Media, LLC.