Ononot — For each real number r \in \mathbb{R}, define the set of poi

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Set Theoryhard

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For each real number $r \in \mathbb{R}$ , define the set of points in the Cartesian plane: $S_r = \{ (x, y) \in \mathbb{R}^2 : y = r(x^2 - 1) \}$ Which of the following describes the intersection $\bigcap_{r \in \mathbb{R}} S_r$ ?