A group of symbols that make a mathematical statement WordNet 3.0 & Open English WordNet

In science, a formula is a concise way of expressing information symbolically, as in a mathematical formula or a chemical formula. Wikipedia

In mathematics, an expression or mathematical expression is a finite combination of symbols that is well-formed according to rules that depend on the context. Wikipedia

A finite combination of symbols that are well-formed according to applicable rules Wikipedia Disambiguation

Equation using mathematical or scientific notation Wikidata

Formula that represents a mathematical object Wikidata

Any mathematical rule expressed symbolically. OmegaWiki

A particular way of phrasing an idea. OmegaWiki

An arrangement of symbols denoting values, operations performed on them, and grouping symbols. Wiktionary

Mathematics: arrangement of symbols. Wiktionary (translation)

A syntactic expression of a proposition, built up from quantifiers, logical connectives, variables, relation and operation symbols, and, depending on the type of logic, possibly other operators such as modal, temporal, deontic or epistemic ones. Wiktionary

Logic: syntactic expression of a proposition. Wiktionary (translation)