- #1
Jehannum
- 102
- 26
I bought a maths book and have discovered it's somewhat above my level.
In particular I'm confused about one bit of notation. I understand the "is a member of" operator when it takes a set as argument (e.g. n ∈ ℝ) but not when the book uses it with functions (e.g. n ∈ f)
Does n ∈ f mean that the number n can be returned by function f?
In particular I'm confused about one bit of notation. I understand the "is a member of" operator when it takes a set as argument (e.g. n ∈ ℝ) but not when the book uses it with functions (e.g. n ∈ f)
Does n ∈ f mean that the number n can be returned by function f?