Covering code
In coding theory, a covering code is a set of elements (called codewords) in a space, with the property that every element of the space is within a fixed distance of some codeword. == Definition == Let q ≥ 2 {\displaystyle q\geq 2} , n ≥ 1 {\displaystyle n\geq 1} , R ≥ 0 {\displaystyle R\geq 0} be integers.