- #1
PhillipKP
- 65
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Homework Statement
What is the proper notation for writing the set of all ordered pairs of real numbers that are in quadrant 1 and 3 of the real plane?
Homework Equations
The Attempt at a Solution
I was thinking something like
[tex]$\left\{ \left(x_{1},x_{2}\right)\in\mathbb{R}\,:\, x_{1},x_{2}\geq0\right\} +\left\{ \left(x_{1},x_{2}\right)\in\mathbb{R}\,:\, x_{1},x_{2}\leq0\right\} $[/tex]
Is this fine or will including the + operation mean I am including points in the 2nd and 4th quadrant?