Which functions are one-to-one? Which functions are onto? Describe the inverse function for any bijective function. a) f : Z → N where f is defined by f (x) = x4 + 1 b) f : N → N where f is defined by f (x) = { x/2 if x is even x + 1 if x is odd c)  f : N → N where f is defined by f (x) = { x + 1 if x is even x − 1 if x is odd

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Which functions are one-to-one? Which functions are onto? Describe the inverse
function for any bijective function.

a) f : Z → N where f is defined by f (x) = x4 + 1

b) f : N → N where f is defined by f (x) = {
x/2 if x is even
x + 1 if x is odd

c)  f : N → N where f is defined by f (x) = {
x + 1 if x is even
x − 1 if x is odd

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