Generalized arithmetic progression

In mathematics, a multiple arithmetic progression, generalized arithmetic progression, k-dimensional arithmetic progression or a linear set, is a set of integers or tuples of integers constructed as an arithmetic progression is, but allowing several possible differences. So, for example, we start at 17 and may add a multiple of 3 or of 5, repeatedly. In algebraic terms we look at integers

a + mb + nc + \ldots

where $a, b, c$ and so on are fixed, and $m, n$ and so on are confined to some ranges

0

≤

m

≤

M

and so on, for a finite progression. The number $k$ , that is the number of permissible differences, is called the dimension of the generalized progression.

More generally, let

L(C;P)

be the set of all elements $x$ in $N^n$ of the form

x = c_0 + \sum_{i=1}^m k_i x_i,

with $c_0$ in $C$ , $x_1, \ldots, x_m$ in $P$ , and $k_1, \ldots, k_m$ in $N$ . $L$ is said to be a linear set if $C$ consists of exactly one element, and $P$ is finite.

A subset of $N^n$ is said to be semilinear if it is a finite union of linear sets.

References

Nathanson, Melvyn B. (1996). Additive Number Theory: Inverse Problems and Geometry of Sumsets. Graduate Texts in Mathematics 165. Springer. ISBN 0-387-94655-1. Zbl 0859.11003.

Generalized arithmetic progression

See also

References