# Vector group

From Encyclopedia of Mathematics

A partially ordered group which is imbeddable in a complete direct product of totally ordered groups (cf. Totally ordered group). A group is a vector group if and only if its partial order is an intersection of total orders on . A partially ordered group will be a vector group if and only if its semi-group of positive elements satisfies the following condition: For any finite collection of elements of ,

where this intersection is taken over all combinations of signs , while denotes the smallest invariant sub-semi-group of containing . An orderable group is a vector group if and only if for any it follows from that .

#### References

[1] | L. Fuchs, "Partially ordered algebraic systems" , Pergamon (1963) |

**How to Cite This Entry:**

Vector group. A.I. KokorinV.M. Kopytov (originator),

*Encyclopedia of Mathematics.*URL: http://www.encyclopediaofmath.org/index.php?title=Vector_group&oldid=15917

This text originally appeared in Encyclopedia of Mathematics - ISBN 1402006098