Which of the following definitions describe functions from the domain to the codomain

Chapter 5, Problem 16

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QUESTION:

Which of the following definitions describe functions from the domain to the codomain given? Which functions are one-to-one? Which functions are onto? Describe the inverse function for any bijective function. a. f: Z2 S N where f is defined by f(x, y) = x2 + 2y2 b. f: N S N where f is defined by f(x) = e x2 if x is even x + 1 if x is odd c. g: R S R where g is defined by g(x) = 1"(x + 1) d. f: N S N where f is defined by f(x) = e x + 1 if x is even x 1 if x is odd e h: N3 S N where h is given by h(x, y, z) = x + y z f. g: N2 S N3 where g is defined by g(x, y) = (y, x, 0)

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QUESTION:

Which of the following definitions describe functions from the domain to the codomain given? Which functions are one-to-one? Which functions are onto? Describe the inverse function for any bijective function. a. f: Z2 S N where f is defined by f(x, y) = x2 + 2y2 b. f: N S N where f is defined by f(x) = e x2 if x is even x + 1 if x is odd c. g: R S R where g is defined by g(x) = 1"(x + 1) d. f: N S N where f is defined by f(x) = e x + 1 if x is even x 1 if x is odd e h: N3 S N where h is given by h(x, y, z) = x + y z f. g: N2 S N3 where g is defined by g(x, y) = (y, x, 0)

ANSWER:

Step 1 of 7

A function is a mapping from one set to another that associates with each member of the starting set exactly one member of the ending set. The starting set for a function is called domain and the ending set for a function.

A function  is one-to-one, or injective, if no member of  is the image under  of two distinct elements of.

A function is an onto or surjective function if the range of  equals the codomain of .

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