User:Dfeuer/Cone Condition Equivalent to Irreflexivity
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Theorem
Let $(G,\circ)$ be a group with identity $e$.
Let $C$ be a cone compatible with $\circ$.
Let $\mathcal R$ be the compatible relation on $G$ induced by $C$.
Then the following are equivalent:
- $\mathcal R$ is irreflexive.
- $\mathcal R$ is not reflexive.
- $e \notin C$
- $e \notin C^{-1}$
Proof
Relation Compatible with Group is Reflexive or Irreflexive and Cone Condition Equivalent to Reflexivity