The LDOCE5 states that "notation" is
a system of written marks or signs used to represent something such as music, mathematics, or scientific ideas
It mentions that this word can be both countable and uncountable but does not say when to use which one. Could you give some example on the difference between notation and notations?
I want to write a paper and I don't know which one of the following expressions is better for the topic of a section:
Notation and parameters
Notations and parameters