Vague Memes

Every math student's nightmare lurking in proofs: "Let ε be arbitrarily small." Translation: "I'm about to make your life unnecessarily complicated without specifying exactly how small is small enough." The mathematical equivalent of your friend saying "I'll be there in 5 minutes" when they haven't even left their house yet. Calculus professors worldwide high-five each other whenever they unleash this phrase upon unsuspecting students.