Let f: X →Y be an injective function, and A, B C X. Prove that Q1) f(A)n f(B) C f(AN B).

Q: Suppose f: R → R is the squaring function, that is, f(x) = x² for every real number . Mark all of…

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Q: 6. Determine the type of the following functions ( Injection, Surjection, Bijection?). a) Let f be…

A: The solution given as,   a:-  Let 'f' be the function from             a,b,c,d to1,2,3      and…

Q: Are the following functions quasi-concave? Assume x ≥ 0 a) f(x) = a b) f(x) = a + cx², c < 0

A: Both questions are different so I soved 1st queation if you want 2nd one then repost it again.

Q: For S in the domain of f, let f ( 5 ) = { f(x): * € S}. Let C and D f de subsets of the domain of f.…

A: S is in the domain of f fS=fx: x∈S Let C and D be subsets of the domain of f Then we have to show…

Q: f : A → B and g : B → C are functions such that g ◦ f is surjective, then f is surjective. (ii)  If…

A: Introduction: A function f (from set A to B) is surjective if and only if there is at least one x in…

Q: Q: Show that the functi on f:R →R given by f (x) = ax +b, where ab e R, a #0 is a bijection.

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Q: Let f: X→Y be a function, and let A,BCY. Prove or disprove: f-¹(A)uf-¹(B).

A: The given statement : f-1(A ∪ B) = f-1(A) ∪ f-1(B) is true and we shall prove this statement.

Q: Suppose f: Q→ Z where (a) Is f one-to-one? Justify. ƒ(x) = [² 2 ¹]

A: One-one functions maps a image back to a single pre-image Onto function maps every element in…

Q: Suppose that f : A → B is a function, C C B and D C B. Prove that Š (C – D) = } (C) - } (D).

A: Solution :-

Q: d) Let the set A = {1, 2, 3,4} and let P(A) denote the power-set of A. Consider the following…

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Q: Define a function f : Q → N of your choice which is surjective. Then prove that the function you…

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Q: f: A → B is a function, Let B1 ⊆ B ve B2 ⊆ B. f−1(B1 ∪ B2) = f−1(B1) ∪ f-1(B2) Show that it is…

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Q: Let f : A → B be a function. Prove that for any B1, B2, ⊂ B, f -1(B1) ∪ f -1(B2) ⊂ f -1(B1 ∪ B2)

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Q: 3. Let f : R→R be a function defined by f(r) = 2x + 1. Is this function (only) injective, (only)…

A: Let us consider the function f: A→B then the function is said to be  Injective or one-one :That is…

Q: If ƒ : R → R and g : R → R are both one-to-one, is f + g one-to-one? If f and g are both onto, is f…

A: As per the guideline I’m supposed to solve only first question from the given questions. And the…

Q: Let f be the function defined by f (x) = x³ – x² – 6x. What is the absolute maximum value of f on…

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Q: Let f : Z5 ! Z5 be a function by f([a]) = [3a + 2]: (a) Show that f is well-de ned. (b) Determine…

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Q: Let f: A → B be a function and let a ∈ A and b ∈ B. Does this mean it is true that f(a) = b? If not,…

A: We use definition of function .

Q: Let A = Z and B = Z. Suppose f: A ∈ B is defined by the rule f(a) = a3 + a + 1. Determine f(−1) and…

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Q: Consider the function f : R →R defined by f (x) = 2x + 1. This function is:

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Q: Determine if each function is injective, surjective or bijective. Give one counterexample for each…

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Q: Iff: X→Y is an injective function and A, BCX then: f(A-B) f(A)- f(B)

A: Use the concept of injection map of functions.

Q: Use the function f(r) given below to answer the questions that follow. f(r) = – 2(r+1)(r – 3) (r –…

A: The given function f(r)=-2r+1r-33(r-1)

Q: Given x = {5,10,15,20,25,30} and y function from X to Y. Let f(5) = 400, f(10) = 100, f(15) = 500, f…

A: x=5, 10, 15, 20, 25, 30  &amp;  y=100, 200, 300, 400, 500, 600. f5=400,  f10=100,  f15=500,…

Q: We have shown that the composition of two surjective functions is surjective, i.e. th if f : A → B…

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Q: Show that f (a) = is Libschitz function on r+ 2

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Q: x²+2x-3 Guess and check

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