Showing papers by "Henryk Iwaniec published in 2009"
TL;DR: In this paper, the authors count the number S(x) of quadruples for which a prime number is a determinant and satisfy the determinant condition: x ≥ 1.
Abstract: We count the number S(x) of quadruples $ {\left( {x_{1} ,x_{2} ,x_{3} ,x_{4} } \right)} \in \mathbb{Z}^{4} $
for which
$$ p = x^{2}_{1} + x^{2}_{2} + x^{2}_{3} + x^{2}_{4} \leqslant x $$
is a prime number and satisfying the determinant condition: x
1
x
4 − x
2
x
3 = 1. By means of the sieve, one shows easily the upper bound S(x) ≪ x/log x. Under a hypothesis about prime numbers, which is stronger than the Bombieri–Vinogradov theorem but is weaker than the Elliott–Halberstam conjecture, we prove that this order is correct, that is S(x) ≫ x/log x.
25 citations