Srinivasa Iyengar Ramanujan, Indian mathematician (Erode, Tamil Nadu 22 December 1887 – Chetput, Madras 26 April 1920)
Discovered mock theta functions (1920)
Imagined a method for calculating the value of π number
Derived a formula for determination of quantity of primes lower than a given previously number
Discovered properties of congruency, symmetry and other kinds of relations
First to discover some arithmetical properties of p(n), the number of unrestricted partitions of n
EPONYMY
Hardy-Ramanujan-Littlewood circle method
Roger-Ramanujan identities (1913)
Rogers-Ramanujan continuous fraction
Hardy-Ramanujan number
Ramanujan conjecture
Ramanujan congruence
Ramanujan theta function
Landau-Ramanujan function
Landau-Ramanujan constant
Ramanujan primes (1919)
Ramanujan sum (1918)
Ramanujan summation
Ramanujan-Soldner constant
Ramanujan expansion (1918)
Ramanujan-Eisenstein series
Ramanujan-Sato series
Ramanujan-Dirichlet series
Hardy-Ramanujan series
Hardy-Ramanujan-Rademacher asymptotic partition formula (1918);
Hardy-Ramanujan inequalities
Ramanujan graphs
Ramanujan-Petersson conjecture
Ramanujan constant
Ramanujan tau function or Ramanujan congruences (1916)
Ramanujan-Nagell equation (1913)
Ramanujan-Skolem theorem
Dougall-Ramanujan identity
Nielsen-Ramanujan constant