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#### QuestForInsight

##### Member

- Jul 22, 2012

- 35

- A map $\left(\xi, \eta\right) \to \xi+\eta$ from $\mathbb{R} \times \mathbb{R}$ into $\mathbb{R}.$

Could someone read the above in plain English, please. Does it mean all ordered pairs in $\mathbb{R}$ can be expressed additively?