Metric function and Single-valued function

Metric function noun - A function of a topological space that gives, for any two points in the space, a value equal to the distance between them.

Single-valued function and metric function are semantically related. In some cases you can use "Single-valued function" instead a noun phrase "Metric function".

Single-valued 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.

Metric function and single-valued function are semantically related. Sometimes you can replace phrase "Metric function" with "Single-valued function", this phrases are similar.