4. Let S = {x EN|3z ENA z? = x)). Let f : N → Sbe the function f(x) = x². Is f 1-1? Onto? Show why.

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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Answer only question 4
1. Suppose f(x) = 2x + 3, g(x) = 17- x', and h(x) = 1 · (x + 1). Recall the definition of
function composition p • q, and show functions resulting from the composition of
fo g, f goh,h of.
%3D
2. Consider f(x) = 2x + 3. Isf :N → N one-to-one? Is it onto? Prove, or give a
counterexample.
3. Consider f(x) = 5 + 4x is a bijection using the definition in class. Is f: Z→Z one-to-
one? Is it onto?
4. Let S = {x E Nzz ENA z? = x)). Letf : N → S be the function f(x) = x². Is f
1-1? Onto? Show why.
5. Find a bijection between Z and E (the even numbers), prove your answer is correct.
6. Consider the infinite set W of all finite strings of binary numerals 0, 1, for example:
10
11
100
Demonstrate whether W is countable set.
Transcribed Image Text:1. Suppose f(x) = 2x + 3, g(x) = 17- x', and h(x) = 1 · (x + 1). Recall the definition of function composition p • q, and show functions resulting from the composition of fo g, f goh,h of. %3D 2. Consider f(x) = 2x + 3. Isf :N → N one-to-one? Is it onto? Prove, or give a counterexample. 3. Consider f(x) = 5 + 4x is a bijection using the definition in class. Is f: Z→Z one-to- one? Is it onto? 4. Let S = {x E Nzz ENA z? = x)). Letf : N → S be the function f(x) = x². Is f 1-1? Onto? Show why. 5. Find a bijection between Z and E (the even numbers), prove your answer is correct. 6. Consider the infinite set W of all finite strings of binary numerals 0, 1, for example: 10 11 100 Demonstrate whether W is countable set.
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