Triple

Target entity: Ramanujan’s lost notebook
Context triple: [Slater’s list of identities, relatedTo, Ramanujan’s lost notebook]

• A. Ramanujan’s lost notebook chosen
  Ramanujan’s lost notebook is a posthumously discovered collection of Srinivasa Ramanujan’s final mathematical formulas and insights, many of which were decades ahead of their time in number theory and q-series.
• B. Ramanujan’s last letter to G. H. Hardy
  Ramanujan’s last letter to G. H. Hardy is a famous 1920 correspondence in which the mathematician Srinivasa Ramanujan outlined his mysterious mock theta functions, profoundly influencing later developments in number theory and modular forms.
• C. Ramanujan partition congruences
  Ramanujan partition congruences are remarkable number-theoretic results discovered by Srinivasa Ramanujan that describe surprising modular patterns in the partition function, such as specific arithmetic progressions where the number of integer partitions of an integer is divisible by a given prime.
• D. Hardy–Ramanujan asymptotic formula
  The Hardy–Ramanujan asymptotic formula is a landmark result in number theory that gives an approximate expression for the partition function p(n), describing how the number of integer partitions of n grows rapidly with n.
• E. Ramanujan’s sum
  Ramanujan’s sum is a number-theoretic function introduced by Srinivasa Ramanujan, expressing certain periodic arithmetic functions as finite trigonometric sums over primitive roots of unity.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.