Homework Answers
Ans. In the proof of above expectation there are two conditions are required
1).PX=x,Y=y) is must be a joint pmf of two random variables X and Y.
2). The series in the right hand side of E(T) is absolutely convergent.
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b) The following result is very useful and important, and is stated only in the bivariate...
Problem 5. Prove the following result for any number a and discrete random variable X. 티(X-a...
Problem 5. Prove the following result for any number a and discrete random variable X. 티(X-a 21 = Var(X) + (E(X)-a)2 You must start your proof by using the definition of the expected value of a function of a discrete random variable, i.e. where g(x)- (x-a)
Proposition 6.10 Independent Discrete Random Variables: Bivariate Case Let X andY be two discrete...
Proposition 6.10 Independent Discrete Random Variables: Bivariate Case Let X andY be two discrete random variables defined on the same sample space. Then X and Y are independent if and only if pxy(x,y) = px(x)py(y), for all x , y ER. (6.19) In words, two discrete random variables are independent if and only if their joint equals the product of their marginal PMFs. Proposition 6.11 Independence and Conditional Distributions Discrete random variables X and Y are independent if and only...
need help with proving discrete math HW, please try write clearly and i will give a thumb up thanks!! Let A and be B be...
need help with proving discrete math HW, please try write
clearly and i will give a thumb up thanks!!
Let A and be B be sets and let f:A B be a function. Define C Ax A by r~y if and only if f(x)f(y). Prove thatis an equivalence relation on A. Let X be the set of~-equivalence classes of A. L.e. Define g : X->B by g(x) Prove that g is a function. Prove that g is injective. Since g...
Have to get an idea of how i am doing on this problem. Whould be nice...
Have to get an idea of how i am doing on this problem. Whould be
nice to get a good explaination for each part of the problem. d1
and d2 is the two different metrics, p ,Y.
Problem 2. Consider first the following definition: Definition. Let X be a set and let pand be two metrics on X. We say that p and are equivalent if the open balls in (X, p) and (x,y) are "nested". More precisely, p and...
T'he goal of this problem is to establish the following remarkable result: Bezout's theorern. If a, be Z50, then 3x, y є Z such that gcd(a, b) = ax + by. Here ged(a, b) denotes the greatest c...
T'he goal of this problem is to establish the following remarkable result: Bezout's theorern. If a, be Z50, then 3x, y є Z such that gcd(a, b) = ax + by. Here ged(a, b) denotes the greatest common divisor of a and b (i.e. the largest positive integer that divides both a and b). Throughout this problem, we'll use the notation (a) Write down five numbers that live in 2Z +3Z. What's a simpler name for the set 2Z +3Z?...
Validate each of the following proofs by evaluating each of the following. Foundation for the proof . a. Statement of what the author intends to show. b. Description, in your own words, of what t...
Validate each of the following proofs by evaluating each of the following. Foundation for the proof . a. Statement of what the author intends to show. b. Description, in your own words, of what the statement implies. c. Intuitive justification as to why this is likely to be true. Structure of the proof. . Identify what the author stated as a logical implication. What foundational assumptions will the author make? What will the author be required to demonstrate? Describe the...
(a) Consider a discrete-time signal v[n] satisfying vn0 except if n is a multiple of some fixed integer N. i.e oln] -0, otherwise where m is an integer. Denote its discrete-time Fourier transform by...
(a) Consider a discrete-time signal v[n] satisfying vn0 except if n is a multiple of some fixed integer N. i.e oln] -0, otherwise where m is an integer. Denote its discrete-time Fourier transform by V(eJ"). Define y[nl-v[Nn] Express Y(e) as a function of V(e). Hint : If confused, start with N-2 (b) Consider the discrete-time signal r[n] with discrete-time Fourier transform X(e). Now, let z[n] be formed by inserting two zeroes between any two samples of x[n]. Give a formula...
Notice that the following claim is among one of the multiple steps of proving an important result...
Will rate immediately!
Notice that the following claim is among one of the multiple steps of proving an important result: if A C and B D then A × B C × D. Claim: Let f : A → C and g : B → D be two surjective (onto) functions. Then h: A x B-> C D defined by ћ((a, b))-(f(a), g(b)) is a well-defined function that is surjective. Proof: Since f maps each a E A into f(a)...
QUESTION: PROVE THE FOLLOWING 4.3 THEOREM IN THE CASE r=1(no induction required, just use the definition of the determ...
QUESTION: PROVE THE FOLLOWING 4.3 THEOREM IN THE CASE
r=1(no induction required, just use the definition of the
determinants)
Theorem 4.3. The determinant of an n × n matrix is a linear function of each row when the remaining rows are held fixed. That is, for 1 Sr S n, we have ar-1 ar-1 ar-1 ar+1 ar+1 ar+1 an an rt whenever k is a scalar and u, v, and each a are row vectors in F". Proof. The proof...
only (b) please Exercise 4.3.3. (a) Supply a proof for Theorem 4.3.9 using the ed charac-...
only (b) please
Exercise 4.3.3. (a) Supply a proof for Theorem 4.3.9 using the ed charac- terization of continuity. Excreien: :03a supely a pot be Tovem 130 ming the ó dheas (b) Give another proof of this theorem using the sequential characterization of continuity (from Theorem 4.3.2 (iii)). Theorem 4.3.9 (Composition of Continuous Functions). Given f : A R and g: B + R, assume that the range f(A) = {f(): € A} is contained in the domain B so...
Problem 5. Prove the following result for any number a and discrete random variable X. 티(X-a 21 = Var(X) + (E(X)-a)2 You must start your proof by using the definition of the expected value of a function of a discrete random variable, i.e. where g(x)- (x-a)
Proposition 6.10 Independent Discrete Random Variables: Bivariate Case Let X andY be two discrete random variables defined on the same sample space. Then X and Y are independent if and only if pxy(x,y) = px(x)py(y), for all x , y ER. (6.19) In words, two discrete random variables are independent if and only if their joint equals the product of their marginal PMFs. Proposition 6.11 Independence and Conditional Distributions Discrete random variables X and Y are independent if and only...
need help with proving discrete math HW, please try write
clearly and i will give a thumb up thanks!!
Let A and be B be sets and let f:A B be a function. Define C Ax A by r~y if and only if f(x)f(y). Prove thatis an equivalence relation on A. Let X be the set of~-equivalence classes of A. L.e. Define g : X->B by g(x) Prove that g is a function. Prove that g is injective. Since g...
Have to get an idea of how i am doing on this problem. Whould be
nice to get a good explaination for each part of the problem. d1
and d2 is the two different metrics, p ,Y.
Problem 2. Consider first the following definition: Definition. Let X be a set and let pand be two metrics on X. We say that p and are equivalent if the open balls in (X, p) and (x,y) are "nested". More precisely, p and...
T'he goal of this problem is to establish the following remarkable result: Bezout's theorern. If a, be Z50, then 3x, y є Z such that gcd(a, b) = ax + by. Here ged(a, b) denotes the greatest common divisor of a and b (i.e. the largest positive integer that divides both a and b). Throughout this problem, we'll use the notation (a) Write down five numbers that live in 2Z +3Z. What's a simpler name for the set 2Z +3Z?...
Validate each of the following proofs by evaluating each of the following. Foundation for the proof . a. Statement of what the author intends to show. b. Description, in your own words, of what the statement implies. c. Intuitive justification as to why this is likely to be true. Structure of the proof. . Identify what the author stated as a logical implication. What foundational assumptions will the author make? What will the author be required to demonstrate? Describe the...
(a) Consider a discrete-time signal v[n] satisfying vn0 except if n is a multiple of some fixed integer N. i.e oln] -0, otherwise where m is an integer. Denote its discrete-time Fourier transform by V(eJ"). Define y[nl-v[Nn] Express Y(e) as a function of V(e). Hint : If confused, start with N-2 (b) Consider the discrete-time signal r[n] with discrete-time Fourier transform X(e). Now, let z[n] be formed by inserting two zeroes between any two samples of x[n]. Give a formula...
Will rate immediately!
Notice that the following claim is among one of the multiple steps of proving an important result: if A C and B D then A × B C × D. Claim: Let f : A → C and g : B → D be two surjective (onto) functions. Then h: A x B-> C D defined by ћ((a, b))-(f(a), g(b)) is a well-defined function that is surjective. Proof: Since f maps each a E A into f(a)...
QUESTION: PROVE THE FOLLOWING 4.3 THEOREM IN THE CASE
r=1(no induction required, just use the definition of the
determinants)
Theorem 4.3. The determinant of an n × n matrix is a linear function of each row when the remaining rows are held fixed. That is, for 1 Sr S n, we have ar-1 ar-1 ar-1 ar+1 ar+1 ar+1 an an rt whenever k is a scalar and u, v, and each a are row vectors in F". Proof. The proof...
only (b) please
Exercise 4.3.3. (a) Supply a proof for Theorem 4.3.9 using the ed charac- terization of continuity. Excreien: :03a supely a pot be Tovem 130 ming the ó dheas (b) Give another proof of this theorem using the sequential characterization of continuity (from Theorem 4.3.2 (iii)). Theorem 4.3.9 (Composition of Continuous Functions). Given f : A R and g: B + R, assume that the range f(A) = {f(): € A} is contained in the domain B so...
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