Topological property P is called additive if and only if X1 has P and X2 has P with X1 ∩ X2 = ∅, ...
topological property P is called additive if and only
if X1 has P and
X2 has P with X1 ∩ X2 = ∅, then the sum X1 ⊕ X2 has P.
(a) Prove that T4 is an additive property.
(b) Prove that metrizability is an additive property.
Hint: Work with metrics which are bounded.
(c) Give a topological property which is not additive and prove
your
assertion.
normal and T1
Homework Answers
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Topological property P is called additive if and only if X1 has P and X2 has P with X1 ∩ X2 = ∅, ...
New problems for 2020 1. A topological space is called a T3.space if it is a...
New problems for 2020 1. A topological space is called a T3.space if it is a T, space and for every pair («,F), where € X and F(carefull), there is a continuous function 9 :X (0,1 such that f(x) 0 and f =1 on F. Prove that such a space has the Hausdorff Separation Property. (Hint: One point subsets are closed.] 2. Let X be topological space, and assume that both V and W are subbases for the topology. Show...
Let X1 and X2 be two discrete random variables with joint p.m.f. P(X1k1,X2 - k2). Prove...
Let X1 and X2 be two discrete random variables with joint p.m.f. P(X1k1,X2 - k2). Prove the following claims from the lecture (n) rg : IR2 li (/ : R2 → R is a function , then R İ:: a), fu''.:Lion, l.licn k1,k2 (b) E[Xi +X2-EXi +EX2. Hint: Use part (a).
Topology 3. Either prove or disprove each of the following statements: (a) If d and p...
Topology
3. Either prove or disprove each of the following statements: (a) If d and p map (X, d) X, then the identity topologically equivalent metrics (X, p) and its inverse are both continuous are two on (b) Any totally bounded metric space is compact. (c) The open interval (-r/2, n/2) is homeomorphic to R (d) If X and Y are homeomorphic metric spaces, then X is complete if and only if Y is complete (e) Let X and Y...
Christine has utility given by u(x1, x2) = 1X1 + 4/X2. If P, = $10, P,...
Christine has utility given by u(x1, x2) = 1X1 + 4/X2. If P, = $10, P, = $20, and 1 = $180, find Christine's optimal consumption of good 1. (Hint: You'll need to use the 5 step method to answer this question). Using the information from question 7, find Christine's optimal consumption of good 2
6. Modou has a utility function U(X1,X2) = 2X1 + X2 The prices of X1 &...
6. Modou has a utility function U(X1,X2) = 2X1 + X2 The prices of X1 & X2 are $1 each and Modou has an income of $20 budgeted for this two goods. a. Draw the demand curve for X1 as a function of p1.: b. At a price of p1 = $1, how much X1 and X2 does Modou consume?: c. A per unit tax of $0.60 is placed on X1. How much of good X1 will he consume now?:...
Consider the utility function: u(x1,x2) = x1 +x2.
1. Consider the utility function: u(x1,x2) = x1 +x2. Find the corresponding Hicksian demand function 2. For each of the three utility functions below, find the substitution effect, the income effect, and the total effect that result when prices change from p = (2,1) to p' = (2,4). Assume the consumer has income I = 20. (a) Before doing any calculation, make an educated guess about the relative magnitude of the three substitution effects and the three income effects to be found below. (b)...
e (4 marks) Let m be an integer with the property that m 2 2. Consider that X1, X2,.. ., Xm are independent Binomial(n,p) random variables, where n is known and p is unknown. Note that p E (0,1). Wr...
e (4 marks) Let m be an integer with the property that m 2 2. Consider that X1, X2,.. ., Xm are independent Binomial(n,p) random variables, where n is known and p is unknown. Note that p E (0,1). Write down the expression of the likelihood function We assume that min(x1, . . . ,xm) 〈 n and max(x1, . . . ,xm) 〉 0 5 marks) Find , and give all possible solutions to the equation dL dL -...
Let V = R2 with the following operations: (zı, yı) + (2 2,32) = (x1 +T2-1,...
Let V = R2 with the following operations: (zı, yı) + (2 2,32) = (x1 +T2-1, yı +B2) (addition) c(x1, y) = (czi-e+ 1, cy) where c E R (scalar multiplication). Then V is a vector space with these operations (you can take this as given). (a) (2) Let (-2,4) and (2,3) belong to V and let c -2 R. Find ca + y using the operations defined on V. (b) (2) What is the zero vector in V? Justify....
Cursue a consumer with preferences described by (x1, x2) = x1 + x2 Suppose she faces...
Cursue a consumer with preferences described by (x1, x2) = x1 + x2 Suppose she faces prices pi 1 and P2 = 1/2 and that she has an income of I = 2. For your reference, the marginal utilities at a bundle (x1, x2) in this setting are given by MU (x1, x2) = 1 MU?(x), x2) = 2V x2 3(a) Write down the two equations which characterize the consumer's utility-maximizing bundle (X1.3) in this situation. In other words, write...
2 = -4 and x3 = 0, with p = 1 and W = span{x1, X2,...
2 = -4 and x3 = 0, with p = 1 and W = span{x1, X2, X3}. 4) Let x1 = -2, X2 3 (a) W is a subspace of R". What is n? (b) Find a basis for W. (c) Isp EW? (d) Give a geometric description of W.
New problems for 2020 1. A topological space is called a T3.space if it is a T, space and for every pair («,F), where € X and F(carefull), there is a continuous function 9 :X (0,1 such that f(x) 0 and f =1 on F. Prove that such a space has the Hausdorff Separation Property. (Hint: One point subsets are closed.] 2. Let X be topological space, and assume that both V and W are subbases for the topology. Show...
Let X1 and X2 be two discrete random variables with joint p.m.f. P(X1k1,X2 - k2). Prove the following claims from the lecture (n) rg : IR2 li (/ : R2 → R is a function , then R İ:: a), fu''.:Lion, l.licn k1,k2 (b) E[Xi +X2-EXi +EX2. Hint: Use part (a).
Topology
3. Either prove or disprove each of the following statements: (a) If d and p map (X, d) X, then the identity topologically equivalent metrics (X, p) and its inverse are both continuous are two on (b) Any totally bounded metric space is compact. (c) The open interval (-r/2, n/2) is homeomorphic to R (d) If X and Y are homeomorphic metric spaces, then X is complete if and only if Y is complete (e) Let X and Y...
Christine has utility given by u(x1, x2) = 1X1 + 4/X2. If P, = $10, P, = $20, and 1 = $180, find Christine's optimal consumption of good 1. (Hint: You'll need to use the 5 step method to answer this question). Using the information from question 7, find Christine's optimal consumption of good 2
e (4 marks) Let m be an integer with the property that m 2 2. Consider that X1, X2,.. ., Xm are independent Binomial(n,p) random variables, where n is known and p is unknown. Note that p E (0,1). Write down the expression of the likelihood function We assume that min(x1, . . . ,xm) 〈 n and max(x1, . . . ,xm) 〉 0 5 marks) Find , and give all possible solutions to the equation dL dL -...
Let V = R2 with the following operations: (zı, yı) + (2 2,32) = (x1 +T2-1, yı +B2) (addition) c(x1, y) = (czi-e+ 1, cy) where c E R (scalar multiplication). Then V is a vector space with these operations (you can take this as given). (a) (2) Let (-2,4) and (2,3) belong to V and let c -2 R. Find ca + y using the operations defined on V. (b) (2) What is the zero vector in V? Justify....
Cursue a consumer with preferences described by (x1, x2) = x1 + x2 Suppose she faces prices pi 1 and P2 = 1/2 and that she has an income of I = 2. For your reference, the marginal utilities at a bundle (x1, x2) in this setting are given by MU (x1, x2) = 1 MU?(x), x2) = 2V x2 3(a) Write down the two equations which characterize the consumer's utility-maximizing bundle (X1.3) in this situation. In other words, write...
2 = -4 and x3 = 0, with p = 1 and W = span{x1, X2, X3}. 4) Let x1 = -2, X2 3 (a) W is a subspace of R". What is n? (b) Find a basis for W. (c) Isp EW? (d) Give a geometric description of W.
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