TheoremBase

Absolute Value in an Ordered Field

Statement

Let FF be an ordered field, with order relation ≤\le, zero element 00, and additive inverse −x-x of an element xx, and let x∈Fx\in F.

The absolute value of xx is the element ∣x∣|x| of FF given by

∣x∣=xif 0≤x,and∣x∣=−xif 0≤x does not hold.|x|=x\quad\text{if }0\le x,\qquad\text{and}\qquad |x|=-x\quad\text{if }0\le x\text{ does not hold.}

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