A partially ordered group within which the Archimedean axiom is valid: If $a^n<b$ for all integers $n$ ($a$ and $b$ are elements of the Archimedean group), then $a$ is the unit of the group (in additive notation: If $na<b$ for all integers $n$, then $a=0$). Totally ordered Archimedean groups may be described as follows (Hölder's theorem): A totally ordered group is Archimedean if and only if it is isomorphic to some subgroup of the additive group of real numbers with the natural order. Thus, the additive group of all real numbers is in a certain sense the largest totally ordered Archimedean group. All Archimedean lattice-ordered groups are commutative. Totally ordered groups without non-trivial convex subgroups are Archimedean.
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Archimedean group. Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Archimedean_group&oldid=39069