Mathematics · Topology

Consider the subset of &mathbb{R} 2 defined as follows: A = {(x, y) ∈ &mathbb{R} × &mathbb{R} : (x - 1)(x - 2)(y - 3)(y + 4) = 0}. Which of the following statements is true?

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Consider the subset of &mathbb{R} 2 defined as follows: A = {(x, y) &isin; &mathbb{R} &times; &mathbb{R} : (x - 1)(x - 2)(y - 3)(y + 4) = 0}. Which of the following statements is true?