Question

In: Advanced Math

3. Let X = {1, 2, 3, 4}. Let F be the set of all functions...

3. Let X = {1, 2, 3, 4}. Let F be the set of all functions from X to X. For any relation R on X, define a relation S on F by: for all f, g ∈ F, f S g if and only if there exists x ∈ X so that f(x)Rg(x).

For each of the following statements, prove or disprove the statement.

(a) For all relations R on X, if R is reflexive then S is reflexive.

(b) For all relations R on X, if S is reflexive then R is reflexive.

(c) For all relations R on X, if R is symmetric then S is symmetric.

(d) For all relations R on X, if S is symmetric then R is symmetric.

Solutions

Expert Solution


Related Solutions

2. Let A = {1,2,3,4}. Let F be the set of all functions from A to...
2. Let A = {1,2,3,4}. Let F be the set of all functions from A to A. Recall that IA ∈ F is the identity function on A given by IA(x) = x for all x ∈ A. Consider the function E : F → A given by E(f) = f(1) for all f ∈ F. (a) Is the function E one-to-one? Prove your answer. (b) Is the function E onto? Prove your answer. (c) How many functions f ∈...
Find all functions f(x) with f′′(x) = 3x^3 − 2x^2 + x, f(0) = 1, and...
Find all functions f(x) with f′′(x) = 3x^3 − 2x^2 + x, f(0) = 1, and f(1) = 1.
Let  f(x) = x^4 - 4x^3 - 18 x^2  + 77   a)   a) Find all critical values of the...
Let  f(x) = x^4 - 4x^3 - 18 x^2  + 77   a)   a) Find all critical values of the function.       [10]    b)   b) Find all intervals of increase and decrease.      [10]       c) Find all relative extrema. Use the second derivative test.          Label each as a relative max. or a relative min.      [10] d)   d) Find on what interval(s) the function is concave up and concave down.      [10]     e)   e) Find all inflection point(s), if any, of the function.       [10]
part 1) Let f(x) = x^4 − 2x^2 + 3. Find the intervals of concavity of...
part 1) Let f(x) = x^4 − 2x^2 + 3. Find the intervals of concavity of f and determine its inflection point(s). part 2) Find the absolute extrema of f(x) = x^4 + 4x^3 − 8x^2 + 3 on [−1, 2].
Please find f(x') and f(x") for all: 1) f(x) = 3(x2 -2x)3/4(7 - 5x2)6 2) f(x)...
Please find f(x') and f(x") for all: 1) f(x) = 3(x2 -2x)3/4(7 - 5x2)6 2) f(x) = (y - x)4(y2 - x)3 3) f(x) = x7/3 + 16x3 + x 4) = f(x) = (x2 - x) / (y2 - y)
2. Consider functions f : {1, 2, 3, 4, 5, 6} → {1, 2, 3, 4,...
2. Consider functions f : {1, 2, 3, 4, 5, 6} → {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. (a) How many of these functions are strictly increasing (i.e. f(1) < f(2) < f(3) < f(4) < f(5) < f(6))? Hint: How many different possibilities are there for the range of f? For each range of f, how many strictly increasing functions are there? (b) How many of these functions are non-decreasing (i.e. f(1) ≤ f(2) ≤...
Differentiate the following: 1) f(x) = √2x-4. (all under square root) 2) f(x) = x/5-x 3)...
Differentiate the following: 1) f(x) = √2x-4. (all under square root) 2) f(x) = x/5-x 3) y=cos(4x^3) 4) f(x)=tan(x^2) 5) f(x)= 3e^2x cos(2x) 6) y= sin2x/cosx 7) y= √sin(cosx) (all under the square root)
Let f(x)=(x^2+1)*(2x-3) Find the equation of the line tangent to the graph of f(x) at x=3....
Let f(x)=(x^2+1)*(2x-3) Find the equation of the line tangent to the graph of f(x) at x=3. Find the value(s) of x where the tangent line is horizontal.
Let f(x) = x / (4−x^2) . (a) Find the domain and intercepts of f(x). (b)...
Let f(x) = x / (4−x^2) . (a) Find the domain and intercepts of f(x). (b) Find all asymptotes and limits describing the end behavior of f(x). (c) Find all local extrema and the intervals on which f(x) is increasing or decreasing. (d) Find the inflection points and the concavity of f(x). (e) Use this information to sketch the graph of f(x)
Let X = {1, 2, 3, 4, 5, 6} and let ∼ be given by {(1,...
Let X = {1, 2, 3, 4, 5, 6} and let ∼ be given by {(1, 1),(2, 2),(3, 3),(4, 4),(5, 5),(6, 6),(1, 3),(1, 5),(2, 4),(3, 1),(3, 5), (4, 2),(5, 1),(5, 3)}. Is ∼ an equivalence relation? If yes, write down X/ ∼ .
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT