Mathematical function and Mathematical relation

Mathematical function noun - Mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function.

Mathematical relation and mathematical function are semantically related. In some cases you can use "Mathematical relation" instead a noun phrase "Mathematical function".

Mathematical relation noun - A relation between mathematical expressions (such as equality or inequality).

Mathematical function and mathematical relation are semantically related. Sometimes you can replace phrase "Mathematical function" with "Mathematical relation", this phrases are similar.