Problem 1E: Why is f not a function from R to R if f(x)=1/x? f(x)=x? f(x)=(x2+a)? Problem 2E: Determine whether f is a function from Z to R if f(n)=n . f(n)=n2+1 . f(n)=1/(n24) . Problem 3E Problem 4E: Find the domain and range of these functions. Note that in each case, to find the domain, determine... Problem 5E: Find the domain and range of these functions. Note that in each case, to find the domain, determine... Problem 6E: Find the domain and range of these functions. the function that assigns to each pair of positive... Problem 7E: Find the domain and range of these functions. the function that assigns to each pair of positive... Problem 8E: Find these values. 1.1 1.1 0.1 0.1 2.99 2.99 12+12 12+12+12 Problem 9E: Find these values. 34 78 34 78 3 1 12+32 1252 Problem 10E Problem 11E: Which functions in Exercise 10 are onto? Determine whether each of these functions from {a,b,c,d} to... Problem 12E: Determine whether each of these functions from Z to Z is one-to-one. f(n)=n1 f(n)=n2+1 f(n)=n3... Problem 13E Problem 14E: Determine whether f:ZZZ is onto if f(m,n)=2mn . f(m,n)=m2n2 . f(m,n)=m+n+1 . f(m,n)=|m||n| .... Problem 15E: Determine whether the function f:ZZZ is onto if f(m,n)=m+n . f(m,n)=m2+n2 . f(m,n)=m . f(m,n)=|n| .... Problem 16E: Consider these functions from the set of students in a discrete mathematics class. Under what... Problem 17E: Consider these functions from the set of teachers in a school. Under what conditions is the function... Problem 18E: Specify a codomain for each of the functions in Exercise 16. Under what conditions is each of these... Problem 19E: Specify a codomain for each of the functions in Exercise 17. Under what conditions is each of the... Problem 20E Problem 21E: Give an explicit formula for a function from the set of integers to the set of positive integers... Problem 22E: Determine whether each of these functions is a bijection from R to R. f(x)=3x+4 f(x)=3x2+7... Problem 23E: Determine whether each of these functions is a bijection from R to R. f(x)=2x+1 f(x)=x2+1 f(x)=x3... Problem 24E: Let f:RR and let f(x)0 for all xR . Show that f(x) is strictly increasing if and only if the... Problem 25E: Let f:RR and 1et f(x)0 for all xR . Show that f(x) is strictly decreasing if and only if the... Problem 26E: Prove that a strictly increasing function from R to itself is one-to-one. Give an example of an... Problem 27E Problem 28E: Show that the function f(x)=ex from the set of real numbers to the set of real numbers is not... Problem 29E Problem 30E: Let S={1,0,2,4,7} . Find f(S) if f(x)=1 . f(x)=2x+1 . f(x)=x/5 . f(x)=(x2+1)/3 . Problem 31E: Let f(x)=x2/3 . Find f(S) if S={2,1,0,1,2,3} S={0,1,2,3,4,5} S={1,5,7,11} S={2,6,10,14} Problem 32E: Let f(x)=2x where the domain is the set of real numbers. What is f(Z)? f(N)? f(R)? Problem 33E Problem 34E: Suppose that g is a function from A to B and f is a function from B to C. Prove each of these... Problem 35E Problem 36E: If f and fog are one-to-one, does it follow that g is one-to-one? Justify your answer. Problem 37E Problem 38E: Find fog and gof where f(x)=x2 and g(x)=x+2 , are functions from R to R. Problem 39E Problem 40E: Let f(x)ax+b and g(x)=cx+d , where a, b, c, and d are constants. Determine necessary and sufficient... Problem 41E: Show that the function f(x)ax+b from R to R, where a and b are constants with a0 is invertible, and... Problem 42E Problem 43E Problem 44E: Let f be the function from R to R defined by f(x)=x2 . Find f1({1}) . f1({x0x1}) . f1({xx4}) . Problem 45E: Let g(x)=|x| . Find g1({0}) . g1({1,0,1}) . g1({x0x1}) . Problem 46E Problem 47E Problem 48E: Show x+12 is the closest integer to the number x except when x is midway between two integers when... Problem 49E Problem 50E: Show that if x is a real number, then xx=1 if x is not an integer and xx=0 if x is an integer. Problem 51E Problem 52E Problem 53E Problem 54E: Show that if x is a real number and n is an integer, then xn if and only if xn . nx if and only if... Problem 55E Problem 56E: Prove that if x is a real number, then x=x and x=x . Problem 57E Problem 58E Problem 59E Problem 60E: How many bytes are required to encode n bits of data where n equals 4? 10? 500? 3000? Problem 61E: How many bytes are required to encode n bits of data where n equals 7? 17? 1001? 28,800? Problem 62E: How many ATM cells (described in Example 30) can be transmitted in 10 seconds over a link operating... Problem 63E: Data are transmitted over a particular Ethernet network in blocks of 1500 octets (blocks of 8 bits).... Problem 64E: Draw the graph of the function f(n)=1n2 from Z to Z. Problem 65E: Draw the graph of the function f(x)=2x from R to R. Problem 66E: Draw the graph of the function f(x)=x/2 from R to R. Problem 67E Problem 68E: Draw the graph of the function f(x)=x+x/2 from R to R. Problem 69E: Draw graphs of each of these functions. f(x)=x+12 f(x)=2x+1 f(x)=x/3 f(x)=1/3 f(x)=x2+x+2 f(x)=2xx/2... Problem 70E Problem 71E: Find the inverse function of f(x)=x3+1 . Problem 72E: Suppose that f is an invertible function from Y to Z and g is an invertible function from X to Y.... Problem 73E: Let S be a subset of a universal set U. The characteristic function fS of S is the function from U... Problem 74E: Suppose that f is a function from A to B, where A and B are finite sets with |A|=|B| . Show that f... Problem 75E: Prove or disprove each of these statements about the floor and ceiling functions. x=x for all real... Problem 76E: Prove or disprove each of these statements about the floor and ceiling functions. x=x for all real... Problem 77E: Prove that if x is a positive real number, then x=x . x=x . Problem 78E: Let x be a real number. Show that 3x=x+x+13+x+23 . Problem 79E: For each of these partial functions, determine its domain, codomain, domain of definition, and the... Problem 80E Problem 81E Problem 82E: Show that a set S is infinite if and only if there is a proper subset A of S such that there is a... format_list_bulleted