D S Ramana Author

D. S. Ramana is with the Harish-Chandra Research Institute (HRI), Prayagraj, Uttar Pradesh, India, and was formerly its Acting Registrar. He works in combinatorial and analytic number theory. In particular, he has been interested in problems that apply the large sieve, exponential sums, and ideas from additive combinatorics.  He has supervised several doctoral students, organized and lectured in numerous instructional programmes at various institutions across India on various topics in analytic number theory.

Olivier Ramaré is Senior Researcher at the CNRS, France, in position at Aix-Marseille University, as well as Scientific Officer for the CIMPA. He first became known for his work on the Golbach problem by proving that any even integer can be written as sum of six prime numbers. He worked on the sieve, where from his enveloping sieve stems, on L-functions and on primes. He helped to structure the field of explicit estimates in multiplicative number theory and obtained several results like a particularly simple proof that any arithmetic progression without fixed divisor contains a product of three small primes. He is also involved in the study of mathematical games like solitaire. His latest book, Excursions in Multiplicative Number Theory, has been warmly welcomed.