(physics) The electric charge on a single proton

(logic) A relation between two structures which have the property that every first-order formula is valid in one structure if and only if it is valid in the other.

A student who goes to an elementary school.

plural of elementary equivalence

plural of elementary charge

plural of elementary schooler

(mathematics, education) An informally defined area of algebra considered suitable to be taught to secondary school students.

(linear algebra) A square matrix which is obtained from the identity matrix by a single elementary row (or column) operation.

(category theory) A Cartesian closed category which has a subobject classifier.

A pure chemical substance consisting of a single element (e.g. hydrogen gas).