Mathematicians have trust issues, clearly. This diagram shows the dysfunctional family reunion of mathematical notation where the plus sign (+), sigma (Σ), and integral (∫) are all fighting over who gets to be the real "addition" symbol. It's like mathematical symbols formed their own exclusive club with bizarre entry requirements. "Sorry, plus sign, you're too basic for calculus." "Excuse me, sigma, you can only add discrete things." "Integral, please stop showing off with your continuous summation." Next up: division symbols in a custody battle over who gets to keep the fraction bar on weekends.