User:Dfeuer/OR2
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Theorem
Let $\left({R, +, \circ, \le}\right)$ be an ordered ring with zero $0_R$.
Let $x, y \in R$.
Then the following equivalences hold:
- $x \le y \iff 0_R \le y + (-x)$
- $x \le y \iff 0_R \le (-x) + y$
- $x < y \iff 0_R < y + (-x)$
- $x < y \iff 0_R < (-x) + y$
Proof
By the definition of an ordered ring, $\left({R, +, \le}\right)$ is an ordered group.
Thus by User:Dfeuer/OG2, the stated equivalences hold.