James Singer’s scientific contributions

... Sidon sets are classical objects in additive combinatorics and have been intensely studied over the decades [20,24]. It was first proved by Singer [21] in 1938, that if p is a power of a prime, then one can find p + 1 integers such that their pairwise sums are all different modulo p 2 + p + 1. Since the ratio of consecutive primes tends to 1, this immediately implies that {1, . . . ...

Reference:

Ruzsa’s Problem on Bi-Sidon Sets