Assertion: matrix's entry | /r/HasProperty | number
Facets:
value: usually
type: DEGREE
Source sentences:
text: Usually the entries are numbers, but they may be any kind of mathematical objects for which an addition and a multiplication are defined, that are associative, and such that the addition is commutative, and the multiplication is distributive with respect to the addition.
text: The entries in a matrix can be any number (real or imaginary) or even variables.
text: The entries can be numbers or expressions (as happens when the determinant is used to define a characteristic polynomial); the definition of the determinant depends only on the fact that they can be added and multiplied together in a commutative manner.