Positional notation and System of numeration

Positional notation noun - A numeration system in which a real number is represented by an ordered set of characters where the value of a character depends on its position.

System of numeration and positional notation are semantically related. In some cases you can use "System of numeration" instead a noun phrase "Positional notation".

System of numeration noun - Any notation for the representation of numbers.

Positional notation and system of numeration are semantically related. Sometimes you can replace phrase "Positional notation" with "System of numeration", this phrases are similar.