If a value (e.g. in mathematics or information science) can either decrease or increase let's say by one, does there exist a neutral expression based on increment and decrement which covers both cases?
Here's an example:
The number of players may only increase or decrease exactly by one.
Here's my phantasy English sentence:
The negative player crement is -1. The positive player crement is +1.
I could use the word "change", but what I am really looking for is a noun which precisely describes that the changes are always equidistant, i.e. of the same kind and value.