d30f8f…: “Onto a teal manifold”

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Consider the following graph of a function, $f$ , as seen through this window frame. What can we say about $f(1)$ ?

$f(1)=3$ . $f(1)$ is defined but we do not know it’s value. $f(1)$ is not defined. We don’t know anything about $f(1)$ .