Let X, Y be two topological spaces. Prove that if both are T1 or
T2 then...
Let X, Y be two topological spaces. Prove that if both are T1 or
T2 then X × Y is the same in the product topology. Prove or find a
counterexample for T0.
1.- let(X1, τ1) and (X2, τ2) are two compact topological spaces. Prove that their topological product is also compact.
2.- Let f: X - → Y be a continuous transformation, where X is compact and Y is Hausdorff. Show that if f is bijective then f is a homeomorphism.
A function f : X ------> Y between two
topological spaces ( X , TX ) and ( Y , TY ) is
called a homeomorphism it has the following
properties:
a) f is a bijection (one - to- one and onto
)
b) f is
continuous
c) the inverse fucntion
f -1 is continuous ( f is open
mapping)
A function with these three properties is sometimes called
bicontinuous . if such a function exists, we say X and Y...
1. Let X and Y be non-linear spaces and T : X -->Y. Prove
that if T is One-to-one then T-1 exist
on R(T) and T-1 : R(T) à X is also a linear map.
2. Let X, Y and Z be linear spaces over the scalar field F, and
let T1 ϵ B (X, Y) and T2 ϵ B (Y, Z). let
T1T2(x) = T2(T1x)
∀ x ϵ X.
(i) Prove that T1T2 ϵ B
(X,Y) is also a...
Consider the following history H:
T2:R(Y), T1:R(X), T3:R(Y), T2:R(X), T2:W(Y), T2:Commit, T1:W(X),
T1:Commit, T3:R(X), T3:Commit
Assume that each transaction is consistent.
Does the final database state satisfy all integrity constraints?
Explain.
Let (X,dX),(Y,dY ) be metric spaces and f: X → Y be a continuous
bijection. Prove that if (X, dX ) is compact, then f is a
homeomorphism. (Hint: it might be convenient to use that a function
is continuous if and only if the inverse image of every open set is
open, if and only if the inverse image of every closed set is
closed).
Two solid bodies at initial temperatures T1 and T2, with T1 >
T2, are placed in thermal contact with each other. The bodies
exchange heat only with eachother but not with the environment. The
heat capacities C ≡ Q/∆T of each body are denoted C1 and C2, and
are assumed to be positive.
(a) Is there any work done on the system? What is the total heat
absorbed by the system? Does the internal energy of each subsystem
U1 and...
Problem 16.8 Let X and Y be compact metric spaces and let f: X →
Y be a continuous onto map with the property that
f-1[{y}] is connected for every y∈Y. Show that ifY is
connected then so isX.
Let f : V mapped to W be a continuous function between two
topological spaces V and W, so that (by definition) the preimage
under f of every open set in W is open in V : Y is open in W
implies f^−1(Y ) = {x in V | f(x) in Y } is open in V. Prove that
the preimage under f of every closed set in W is closed in V . Feel
free to take V...
ON PYTHON:
a) Write a function named concatTuples(t1, t2) that concatenates
two tuples t1 and t2 and returns the concatenated tuple. Test your
function with t1 = (4, 5, 6) and t2 = (7,)
What happens if t2 = 7? Note the name of the error.
b) Write try-except-else-finally to handle the above tuple
concatenation problem as follows:
If the user inputs an integer instead of a tuple the result of
the concatenation would be an empty tuple. Include an...