Ramanujan's Notebooks Part I

Srinivasa Ramanujan is, arguably, the greatest mathematician
that India has produced. His story is quite unusual:
although he had no formal education inmathematics, he
taught himself, and managed to produce many important new
results. With the support of the English number theorist G.
H. Hardy, Ramanujan received a scholarship to go to England
and study mathematics. He died very young, at the age of 32,
leaving behind three notebooks containing almost 3000
theorems, virtually all without proof. G. H. Hardy and
others strongly urged that notebooks be edited and
published, and the result is this series of books. This
volume dealswith Chapters 1-9 of Book II; each theorem is
either proved, or a reference to a proof is given.