Abstract: | For a cube of size , we obtain a lower bound on so that is nonempty, where is the algebraic subset of defined by ![\begin{equation*}x_{1}x_{2}x_{3}\dots x_{n}\equiv c\pmod p ,\end{equation*}](http://www.ams.org/proc/1999-127-04/S0002-9939-99-05124-2/gif-abstract/img10.gif)
a positive integer and an integer not divisible by . For we obtain that is nonempty if , for we obtain that is nonempty if , and for we obtain that is nonempty if . Using the assumption of the Grand Riemann Hypothesis we obtain is nonempty if . |