What the Notebooks Are
Ramanujan's notebooks are manuscript records of formulas, identities, transformations and conjectural patterns. Many entries are written in compressed form, often without the surrounding proof, motivation or range of validity that a modern article would supply.
The Three Notebooks
The three notebooks contain a vast collection of results from Ramanujan's earlier and middle mathematical life. This site treats them as a preserved mathematical archive rather than a fully transcribed critical edition.
The Lost Notebook
The Lost Notebook is connected with Ramanujan's final period and later rediscovery. It is especially important for mock theta functions, q-series, partial theta functions and continuing research.
What the Notebooks Contain
Infinite series, infinite products, continued fractions, theta functions, modular equations, q-series, gamma-function identities, definite integrals, partition identities, mock theta functions, approximations and asymptotic expansions all appear in this archive's subject map.
How to Read This Section
Begin with a broad notebook page, then follow the related discoveries into formulas and source notes. The notebook pages are designed as orientation maps: they explain subject clusters, historical caution and mathematical pathways without pretending to reproduce every manuscript entry.
Editorial Principle
Notebook material is presented with care. A result may be historically connected with Ramanujan while still requiring precise source verification, later proof, or clarification about whether the modern name was introduced after him.