Restricted sumset

In additive number theory and combinatorics, a restricted sumset has the form where are finite nonempty subsets of a field F and is a polynomial over F. If is a constant non-zero function, for example for any , then S is the usual sumset which is denoted by nA if . When S is written as which is denoted by if . Note that |S| > 0 if and only if there exist with .

Restricted sumset

In additive number theory and combinatorics, a restricted sumset has the form where are finite nonempty subsets of a field F and is a polynomial over F. If is a constant non-zero function, for example for any , then S is the usual sumset which is denoted by nA if . When S is written as which is denoted by if . Note that |S| > 0 if and only if there exist with .