What is the mathematical definition of equidistant ?
Here I found:
If the distance of each object of a set of objects to the point is same, then the point is called equidistant.
The term is usually used in cases where "the set of objects" refers to more than one object. Can it be used also in case of one object only? Or is there another term for that? I am especially interested in the case of one point in 3 dimensional space (sphere).