Which is the correct way to define a function?
- Define a function f(x) to be f(x)=2x
- Define the function f(x) to be f(x)=2x.
Since f(x)=2x is a specific function, my guess is "the" is correct. But that specification is determined after saying "to be", so it might be "a function".
Also, if there are any other expression to define a function, I would like to know.
Any help is appreciated.