Math Problem Statement
Solution
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Math Problem Analysis
Mathematical Concepts
Set Theory
Real Analysis
Polar Coordinates
Open Intervals
Formulas
R^2 \ {(0, 0)} = ⋃_{r > 0} A_r where A_r = {(r cos θ, r sin θ): θ ∈ [0, 2π)}
{x} = ⋂_{n=1}^∞ (x - 1/n, x + 1/n)
Theorems
Set Union
Set Intersection
Suitable Grade Level
Undergraduate Mathematics