I've lost enough marks in school to know that this is *technically* incorrect since \$$x\$$ is in units of \$$\text{bread}\$$ and \$$y\$$ is in units of \$.

This is like saying, "an electron will jump to a new orbital, before decaying back down and emitting a photon, but only if it has been given *1.2* of energy."

Without the units, this doesn't make sense.

$\Psi(x, y) = \begin{cases} \texttt{false} & \mbox{if } (x = 1 \text{ bread} \mbox{ and } y \lt \ 2) \mbox{ or } (x = 2 \text{ bread} \mbox{ and } y \lt \ 4) \\\\ \texttt{true} & \mbox{otherwise.} \end{cases}$