- Mathematical rule - method of doing something - Recipe - A prescribed or set form; an established rule; a fixed or
conventional method in which anything is to be done, arranged, or said. - A written confession of faith; a formal statement of
foctrines. - A rule or principle expressed in algebraic language; as,
the binominal formula. - A prescription or recipe for the preparation of a
medicinal compound.
- An instrument for experimenting upon the mathematical
relations of musical sounds. It consists of a single string stretched
between two bridges, one or both of which are movable, and which stand
upon a graduated rule for the purpose of readily changing and measuring
the length of the part of the string between them.