A usually simple Algorithm or Identity. The term is frequently applied to specific orders of Newton-Cotes Formulas.
See also Algorithm, BAC-CAB Rule, Bode's Rule, Chain Rule, Cramer's Rule, Descartes' Sign Rule, Durand's Rule, Estimator, Euler's Rule, Euler's Totient Rule, Golden Rule, Hardy's Rule, Horner's Rule, Identity, L'Hospital's Rule, Leibniz Integral Rule, Method, Osborne's Rule, Pascal's Rule, Power Rule, Product Rule, Quarter Squares Rule, Quota Rule, Quotient Rule, Roth's Removal Rule, Rule of 72, Simpson's Rule, Slide Rule, Sum Rule, Trapezoidal Rule, Weddle's Rule, Zeuthen's Rule