Let f : A rightarrow D and g : B rightarrow C be functions. For each...
Help please! Using matlab
Prove or give a counterexample: if f: X rightarrow Y and g: Y rightarrow X are functions such that g o f = I_X and f o g = I_Y, then f and g are both one-to-one and onto and g = f^-1.
D Let fi, f2 A - B and g B -C and h1, h2 C (a) Prove that if g o fi = go f2 and g is injective, then fi = f2 = h2. (b) Prove that if h1 0 g h20g and g is surjective, then h
1. (a) (6 points) Let f : A + B and g:B + C be two functions. Suppose that the composition of functions go f is a bijection. Prove that the function f : A + B must be one-to-one and that the function g:B + C must be onto. (b) (4 points) Give an example of a pair of functions, f and g, such that the composition gof is a bijection, but f is not onto and g is...
I. Functions and Isomorphisms. Let G be a group and let a EG be any non-identity element (so a #e). Define a function f : GG so that, for any r EG, f(x) = (xa)-1 (a) Is f injective? Prove your answer. (b) Is f surjective? Prove your answer. (c) Is f an isomorphism? Prove your answer.
For nonempty sets A, B and C, let f : A → B and g : B → C be functions. Prove that if g ◦ f is injective, then f is injective
1. Let f and g be functions with the same domain and codomain (let A be the domain and B be the codomain). Consider the following ordered triple h = (A, B, f LaTeX: \cap ∩ g) (Note: The f and g in the triple refer to the "rules" associated with the functions f and g). Prove that h is a function. Would the same thing be true if, instead of intersection, we had a union? If your answer is...
Please provide an explanation for each part of the question.
Thanks!
Suppose D, R are sets of sizes ID-d, R-r. How many functions f : D → R are there if … (a) ...there are no further restrictions? r d and f must be injective? (c) ...r- d and f must be a bijection? (d) ..d2r2 and f must be surjective?
Suppose D, R are sets of sizes ID-d, R-r. How many functions f : D → R are there...
A function f : A - B is said to be injective (or one-to-one) provided Va, a2 € A, f(a) = f(az) ► a1 = . A function g: A + B is said to be surjective (or onto) provided W6 € B, 3 some a € A such that g(a) = b. A function h: A → B is said to be bijective (or a bijection or a one-to-one correspondence) if it is both injective and surjective. The following...
2. Let f : A ! B. DeÖne a relation R on A by xRy i§ f (x) = f
(y). a. Prove that R is an equivalence relation on A. b. Let Ex =
fy 2 A : xRyg be the equivalence class of x 2 A. DeÖne E = fEx : x
2 Ag to be the collection of all equivalence classes. Prove that
the function g : A ! E deÖned by g (x) = Ex is...
*4, Let U be an open subset of R" and f:U-R" a function whose component functions have continuous partial derivatives. We say that f is an immersion if Dsf is injective for all v in U and a submersion if Dof is surjective for allv in U. (a) Suppose that f:U-R" is an immersion. Prove that, for each v in U, we can find an open set V of U containing v, an open set W of R" containing f...