Respuesta :
Answer:
a) False. A = {1}, B = {1,2} f: A ⇒ B, f(1) = 1
b) True
c) True
d) B = {1}, A = N, f: N ⇒ {1}, f(x) = 1
Step-by-step explanation:
a) lets use A = {1}, B = {1,2} f: A ⇒ B, f(1) = 1. Here f is injective but 2 is an element of b and |f−¹({b})| = 0., not 1. This statement is False.
b) This is True. If A were finite, then it can only be bijective with another finite set with equal cardinal, therefore, B should be finite (and with equal cardinal). If A were not finite but countable, then there should exist a bijection g: N ⇒ A, where N is the set of natural numbers. Note that f o g : N ⇒ B is a bijection because it is composition of bijections. This, B should be countable. This statement is True.
c) This is true, if f were surjective, then for every element of B there should exist an element a in A such that f(a) = b. This means that f−¹({b}) has positive cardinal for each element b from B. since f⁻¹(b) ∩ f⁻¹(b') = ∅ for different elements b and b' (because an element of A cant return two different values with f). Therefore, each element of B can be assigned to a subset of A (f⁻¹(b)), with cardinal at least 1, this means that |B| ≤ |A|, and as a consequence, B is finite.
b) This is false, B = {1} is finite, A = N is infinite, however if f: N ⇒ {1}, f(x) = 1 for any natural number x, then f is surjective despite A not being finite.
In this exercise we have to analyze the given alternatives and identify if they are true or false:
a) False
b) True
c) True
d) False
a) lets use [tex]A = [1], B = [1,2] f: A \rightarrow B, f(1) = 1[/tex]. Here f is injective but 2 is an element of b and [tex]|f^{-1}({b})| = 0[/tex], not 1. This statement is False.
b) This is True. If A were finite, then it can only be bijective with another finite set with equal cardinal, therefore, B should be finite (and with equal cardinal). If A were not finite but countable, then there should exist a bijection [tex]g: N \rightarrow A[/tex], where N is the set of natural numbers. Note that [tex]f o g : N \rightarrow B[/tex] is a bijection because it is composition of bijections. This, B should be countable. This statement is True.
c) This is true, if f were subjective, then for every element of B there should exist an element a in A such that f(a) = b. This means that f−¹({b}) has positive cardinal for each element b from B. since f⁻¹(b) ∩ f⁻¹(b') = ∅ for different elements b and b' (because an element of A cant return two different values with f). Therefore, each element of B can be assigned to a subset of A (f⁻¹(b)), with cardinal at least 1, this means that |B| ≤ |A|, and as a consequence, B is finite.
b) This is false, B = {1} is finite, A = N is infinite, however if [tex]f: N \rightarrow {1}, f(x) = 1[/tex] for any natural number x, then f is subjective despite A not being finite.
See more about function at brainly.com/question/5245372
