Set Theory Question of the Day

Test your knowledge with a hand-picked multiple-choice question.

Let denote all parabolas in the Cartesian plane. Does , , or both belong to ?

$\S\begin{Bmatrix} (x,y): y=2x^2\end{Bmatrix} \T\begin{Bmatrix} (x,y):y=-x+1 \end{Bmatrix}$

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