Lost Notebook

The Lost Notebook

Ramanujan's final mathematical ideas, and a legacy rediscovered.

The Lost Notebook is associated with Ramanujan's final period and contains material that later became central to mock theta functions, q-series and related modern research.

Lost notebook

Final Period

The material is connected with Ramanujan's last years, including the work he described to Hardy shortly before his death.

Rediscovery

George Andrews found the manuscript material in the 1970s, bringing renewed attention to Ramanujan's final q-series work.

Mathematical Importance

Mock theta functions, partial theta functions, false theta functions, continued fractions and partition identities from this circle of ideas continue to influence research.

Mock Theta Functions

The Lost Notebook is inseparable from the modern study of mock theta functions and q-series. This page links those topics without turning them into visualisations.

Partial and False Theta Functions

Related partial and false theta functions appear in the surrounding q-series landscape and remain important to modern interpretation.

Modern Research

Later work connected mock theta functions to mock modular forms and harmonic Maass forms, a development after Ramanujan rather than terminology he used.

Source Note

Lost Notebook historical account; exact manuscript-level claims require source verification.