Ramanujan’s τ-Function

While studying r₂₄(n) (see Problem 1, Chap. XI), Srinivasa Ramanujan [40] introduced the function τ(n) defined by (0.1) x ∏ n = 1 ∞ ( 1 − x n ) 24 = ∑ n = 1 ∞ τ ( n ) x n ; | x | < 1 https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315139463/240bbb93-6815-40d4-a336-935ccad8ea72/content/eq1670.tif"/>