- #1
Goldenwind
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[SOLVED] "Determine if ___ is a function"
Determine whether f is a function from Z to R if
a) f(n) = ±n.
b) f(n) = Sqrt(n^2 + 1).
c) f(n) = 1 / (n^2 – 4).
Have the book right in front of me, and reading the definitions of functions, transitions, and maps, but nothing's registering in my brain.
To me, ±n would not be a function because it would be the same as the equation x = y^2.
However, this whole "Z to R" business has me lost. I know what Z and R represent, but I don't see how that has any meaning on whether or not f(n) is a function. What is a function? More importantly, what makes something not a function?
Haven't attempted b) or c), as they look even worse. Trying to comprehend the concept of a) first.
Homework Statement
Determine whether f is a function from Z to R if
a) f(n) = ±n.
b) f(n) = Sqrt(n^2 + 1).
c) f(n) = 1 / (n^2 – 4).
The Attempt at a Solution
Have the book right in front of me, and reading the definitions of functions, transitions, and maps, but nothing's registering in my brain.
To me, ±n would not be a function because it would be the same as the equation x = y^2.
However, this whole "Z to R" business has me lost. I know what Z and R represent, but I don't see how that has any meaning on whether or not f(n) is a function. What is a function? More importantly, what makes something not a function?
Haven't attempted b) or c), as they look even worse. Trying to comprehend the concept of a) first.