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Mathematics seems to throw letters our way on occasion, despite consisting primarily of numbers. We can forgive this in algebra, but when those letters seem to twist into strange symbols like the upside-down T, many of us feel lost all over again. The upside-down T (or ⊥) refers to perpendicular lines, which are two lines …

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Imagine writing a paper for your English class. The requirements state that there can be “at most” 10 pages and “at least” 4 to 7 sources. But what do these phrases mean? “At most” refers to a maximum amount, while “at least” generally refers to a minimum. “At most” means that any number less than …

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