   Chapter 1.2, Problem 9E

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# For the given subsets A and B of Z, let f ( x ) = 2 x and determine whether f : A → B is onto and whether it is one-to-one. Justify all negative answers. a. A = Z + , B = Z b. A = Z + , B = Z + ∩ E

a)

To determine

Whether the mapping f:AB is one-to-one or onto or both.

Explanation

Given information:

The given function is,

f(x)=2x

The subset of A is Z+ and the subset of B is Z.

Explanation:

Let f:XY

Function f is called one-to-one, if and only if different elements of A always have different images under f.

Function f is called onto if and only if f(x)=y.

Consider the given function,

f(x)=2x

Let x1 and x2 are elements in A then,

b)

To determine

Whether the mapping f:AB is one-to-one or onto or both.

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