1

There are four poems by Gray in the Oxford Book of English Verse, one of them the endearingly named “On a Favourite Cat, Drowned in a Tub of Gold Fishes.”

2

You’re allowed to do almost anything to an equation, as long as you do the same thing to both sides. You are not allowed, however, to a) take square roots; or b) divide by 0. You wouldn’t normally divide anything by 0 anyway, but if you were to divide something by, say, a-3 and it turned out that a equaled 3, you would get some very odd answers. More on square roots later in this section.