A' Reference book: KREYSZIG Introductory Functional Analysis with Applications Complement of a set A 18, 609 Transpose of a matrix A 113 Space of bounded functions 225 Space of bounded functions 11 Space of functions of bounded variation 226 Space of bounded linear operators 118 B[a,b] B(A) BV4, B(X, Y) B(x) Open ball 18 B(x) Closed ball LR A sequence space 34 C C[a, b] Clab] C(X, Y) A sequence apuce 70 Complex plane or the field of complex numbers 6, 51 Unitary u-space 6 Space of continuous functions 7 Space of continuously differentiable functions 110 Space of compact linear operator 411 Domain of an operato T 83 Dimension of a space X 54 Spectral family 494 Norm of a bounded linear functional 104 Graph of an operator T 292 (T) d(x, y) Distance from toy 3 dim X Krouecker delta 114 2-(E) TH 1 inf ["[a b] " r L(X, Y) M N(T) И Identity operator 84 Infimum (greatest lower bound) 619 A function space 62 A sequence space 11 A sequence space 6 A space of linear operators 118 Annihilator of a set M 148 Null space of an operator T 83 Zero operator 84 Empty set 609 1.3-1 Definition (Ball and sphere). Given a point x, EX and a real number r>0, we define three types of sets: (a) B(xo; r) {xeX|d(x, xo)0 there is a 8>0 such that (see Fig. 6) d(Tx, Txo)

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A'
Reference book:
KREYSZIG
Introductory
Functional
Analysis with
Applications
Complement of a set A 18, 609
Transpose of a matrix A 113
Space of bounded functions 225
Space of bounded functions 11
Space of functions of bounded variation 226
Space of bounded linear operators 118
B[a,b]
B(A)
BV4,
B(X, Y)
B(x)
Open ball 18
B(x)
Closed ball LR
A sequence space 34
C
C[a, b]
Clab]
C(X, Y)
A sequence apuce 70
Complex plane or the field of complex numbers 6, 51
Unitary u-space 6
Space of continuous functions 7
Space of continuously differentiable functions 110
Space of compact linear operator 411
Domain of an operato T 83
Dimension of a space X 54
Spectral family 494
Norm of a bounded linear functional 104
Graph of an operator T 292
(T)
d(x, y)
Distance from toy 3
dim X
Krouecker delta 114
2-(E)
TH
1
inf
["[a b]
"
r
L(X, Y)
M
N(T)
И
Identity operator 84
Infimum (greatest lower bound) 619
A function space 62
A sequence space 11
A sequence space 6
A space of linear operators 118
Annihilator of a set M 148
Null space of an operator T 83
Zero operator 84
Empty set 609
1.3-1 Definition (Ball and sphere). Given a point x, EX and a real
number r>0, we define three types of sets:
(a)
B(xo; r) {xeX|d(x, xo)<r}
(Open ball)
(1) (b)
B(xo; r)= {xX|d(x, xo)≤r}
(Closed ball)
(c)
S(xo; r) ={xex | d(x, xo)=r}
(Sphere)
In all three cases, xo is called the center and r the radius. I
1.3-2 Definition (Open set, closed set). A subset M of a metric space
X is said to be open if it contains a ball about each of its points. A
subset K of X is said to be closed if its complement (in X) is open, that
is, K-X-K is open.
1.3-3 Definition (Continuous mapping). Let X = (X, d) and Y = (Y, d)
be metric spaces. A mapping T: XY is said to be continuous at
a point x0 = X if for every >0 there is a 8>0 such that (see Fig. 6)
d(Tx, Txo)<E
for all x satisfying
d(x, xo)<8.
T is said to be continuous if it is continuous at every point of X. ■
1.3-4 Theorem (Continuous mapping). A mapping T of a metric
space X into a metric space Y is continuous if and only if the inverse
image of any open subset of Y is an open subset of X.
All the required definitions and theorems are attached, now
need solution to given questions, stop copy pasting anything, I
want fresh correct solutions, if you do not know the answers
just skip it otherwise I will downvote you.
Problem 4: Unbounded Operators and Self-Adjoint Extensions
Statement:
Let H be a Hilbert space, and let T: D(T) CH→H be a densely defined, symmetric,
unbounded linear operator.
Tasks:
1. Adjoint Operator Existence:
• Prove that the adjoint operator T" exists and that TCT".
2. Self-Adjoint Extensions via von Neumann's Theory:
Using von Neumann's theory of deficiency indices, characterize when I admits self-adjoint
extensions.
Specifically, show that I has self-adjoint extensions if and only if the deficiency indices
n+(T) = n(T).
3. Essential Self-Adjointness:
•Provide conditions under which I' is essentially self-adjoint, i.e., T=T".
Transcribed Image Text:A' Reference book: KREYSZIG Introductory Functional Analysis with Applications Complement of a set A 18, 609 Transpose of a matrix A 113 Space of bounded functions 225 Space of bounded functions 11 Space of functions of bounded variation 226 Space of bounded linear operators 118 B[a,b] B(A) BV4, B(X, Y) B(x) Open ball 18 B(x) Closed ball LR A sequence space 34 C C[a, b] Clab] C(X, Y) A sequence apuce 70 Complex plane or the field of complex numbers 6, 51 Unitary u-space 6 Space of continuous functions 7 Space of continuously differentiable functions 110 Space of compact linear operator 411 Domain of an operato T 83 Dimension of a space X 54 Spectral family 494 Norm of a bounded linear functional 104 Graph of an operator T 292 (T) d(x, y) Distance from toy 3 dim X Krouecker delta 114 2-(E) TH 1 inf ["[a b] " r L(X, Y) M N(T) И Identity operator 84 Infimum (greatest lower bound) 619 A function space 62 A sequence space 11 A sequence space 6 A space of linear operators 118 Annihilator of a set M 148 Null space of an operator T 83 Zero operator 84 Empty set 609 1.3-1 Definition (Ball and sphere). Given a point x, EX and a real number r>0, we define three types of sets: (a) B(xo; r) {xeX|d(x, xo)<r} (Open ball) (1) (b) B(xo; r)= {xX|d(x, xo)≤r} (Closed ball) (c) S(xo; r) ={xex | d(x, xo)=r} (Sphere) In all three cases, xo is called the center and r the radius. I 1.3-2 Definition (Open set, closed set). A subset M of a metric space X is said to be open if it contains a ball about each of its points. A subset K of X is said to be closed if its complement (in X) is open, that is, K-X-K is open. 1.3-3 Definition (Continuous mapping). Let X = (X, d) and Y = (Y, d) be metric spaces. A mapping T: XY is said to be continuous at a point x0 = X if for every >0 there is a 8>0 such that (see Fig. 6) d(Tx, Txo)<E for all x satisfying d(x, xo)<8. T is said to be continuous if it is continuous at every point of X. ■ 1.3-4 Theorem (Continuous mapping). A mapping T of a metric space X into a metric space Y is continuous if and only if the inverse image of any open subset of Y is an open subset of X. All the required definitions and theorems are attached, now need solution to given questions, stop copy pasting anything, I want fresh correct solutions, if you do not know the answers just skip it otherwise I will downvote you. Problem 4: Unbounded Operators and Self-Adjoint Extensions Statement: Let H be a Hilbert space, and let T: D(T) CH→H be a densely defined, symmetric, unbounded linear operator. Tasks: 1. Adjoint Operator Existence: • Prove that the adjoint operator T" exists and that TCT". 2. Self-Adjoint Extensions via von Neumann's Theory: Using von Neumann's theory of deficiency indices, characterize when I admits self-adjoint extensions. Specifically, show that I has self-adjoint extensions if and only if the deficiency indices n+(T) = n(T). 3. Essential Self-Adjointness: •Provide conditions under which I' is essentially self-adjoint, i.e., T=T".
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