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Choose the correct answer :M.A./M.Sc. (Reg./Pvt./ATKT) Examination, 2024
(Third Semester)
MATHEMATICS
Paper-I
Functional Analysis
рдЦрдгреНрдб 'рдЕ'
Section A
(рдмрд╣реБрд╡рд┐рдХрд▓реНрдк рдкреНрд░рд╢реНрди)
(Objective Type Questions)
рдиреЛрдЯ : рд╕рднреА рдкреНрд░рд╢реНрдиреЛрдВ рдХреЗ рдЙрддреНрддрд░ рджреАрдЬрд┐рдП ред 5├Ч2=10
Attempt all questions.
If (X, || . ||) is a normal linear space then :
(рдЕ) ||x-y|| тЙд ||x-y||
(a) ||x-y|| тЙд ||x-y||
(рдм) ||x-y|| < ||x-y||
(b) ||x-y|| < ||x-y||
(рд╕) рджреЛрдиреЛрдВ (рдЕ) рдФрд░ (рдм)
(c) Both (a) and (b)
(рдж) рдЙрдкрд░реНрдпреБрдХреНрдд рдореЗрдВ рд╕реЗ рдХреЛрдИ рдирд╣реАрдВ
(d) None of the above
A continuous mapping T of a compact subset M of a metric space X into R assumes a maximum and minimum :
(рдЕ) M рдХреЗ рдкреНрд░рддреНрдпреЗрдХ рдмрд┐рдВрджреБ рдкрд░
(a) at every point of M
(рдм) M рдХреЗ рдХреБрдЫ рдмрд┐рдВрджреБрдУрдВ рдкрд░
(b) at some points of M
(рд╕) M рдХреЗ рд╕рднреА рдмрд┐рдВрджреБрдУрдВ рдкрд░
(c) at all points of M
(рдж) M рдХреЗ рдХрд┐рд╕реА рднреА рдмрд┐рдВрджреБ рдкрд░ рдирд╣реАрдВ
(d) at no points of M
If T is a linear operator and dim D(T) = n then :
(рдЕ) dim R(T) тЙд n
(a) dim R(T) тЙд n
(рдм) dim R(T) = n
(b) dim R(T) = n
(рд╕) dim R(T) > n
(c) dim R(T) > n
(рдж) dim R(T) = тИЮ
(d) dim R(T) = тИЮ
The dual space of ..................................... is .
(рдЕ) Rn, Rn
(a) Rn is Rn
(рдм) l1, lтИЮ
(b) l1 is lтИЮ
(рд╕) рджреЛрдиреЛрдВ (рдЕ) рдФрд░ (рдм)
(c) Both (a) and (b)
(рдж) рдЙрдкрд░реНрдпреБрдХреНрдд рдореЗрдВ рд╕реЗ рдХреЛрдИ рдирд╣реАрдВ
(d) None of the above
Which of the following is not Hilbert space ?
(рдЕ) рдпреВрдХреНрд▓рд┐рдбрд┐рдпрди рд╕реНрдкреЗрд╕
(a) Euclidean space
(рдм) рдпреВрдиреАрдЯрд░реА рд╕реНрдкреЗрд╕
(b) Unitary space
(рд╕) рд╕реНрдкреЗрд╕ l2
(c) The space l2
(рдж) рд╕реНрдкреЗрд╕ lp
(d) The space lp
рдЦрдгреНрдб 'рдм'
Section B
(рд▓рдШреБ рдЙрддреНрддрд░реАрдп рдкреНрд░рд╢реНрди)
(Short Answer Type Questions)
рдиреЛрдЯ : рд╕рднреА рдкреНрд░рд╢реНрдиреЛрдВ рдХреЗ рдЙрддреНрддрд░ рджреАрдЬрд┐рдП ред 5├Ч5=25
Attempt all questions.
Define Banach space with an example.
Prove that every finite dimensional subspace Y of a normed space X is closed in X.
рдЕрдерд╡рд╛ (Or)
Prove that on a finite dimensional vector space X any norm || . || is equivalent to any other norm || . ||0.
If T is a linear operator on a vector space X into a vector space Y, then prove that N(T) is a vector space.
рдЕрдерд╡рд╛ (Or)
If T is a bounded linear operator, then prove that the null space N(T) is closed.
Define second algebraic dual space.
рдЕрдерд╡рд╛ (Or)
Prove that an orthonormal set is linearity independent.
рдЦрдгреНрдб 'рд╕'
Section C
(рджреАрд░реНрдШ рдЙрддреНрддрд░реАрдп рдкреНрд░рд╢реНрди)
(Long Answer Type Questions)
рдиреЛрдЯ : рд╕рднреА рдкреНрд░рд╢реНрдиреЛрдВ рдХреЗ рдЙрддреНрддрд░ рджреАрдЬрд┐рдП ред 10├Ч5=50
Attempt all questions.
If in an inner product space xn тЖТ x and yn тЖТ y, then prove that :
If {x1, x2,.....,xn} is a linearly independent set of vectors in a normed space X, then prove that there is a number c > 0 such that for every choice of scalars ╬▒1, ╬▒2, ╬▒3,......,╬▒n:
where c > 0.
рдЕрдерд╡рд╛ (Or)
Prove that in a finite dimensional normed space X any subset M тКВ X is compact if and only if M is closed and bounded.
State and prove Riesz's lemma.
рдЕрдерд╡рд╛ (Or)
If X and Y are metric spaces and T : X тЖТ Y a continuous mapping, then prove that image of a compact subset M of X under T is compact.
If T is a linear operator onto a vector space X into a vector Y, then prove that :
(i) R(T) рдПрдХ рд╡реЗрдХреНрдЯрд░ рд╕реНрдкреЗрд╕ рд╣реИ ред
(i) R(T) is a vector space.
(ii) рдпрджрд┐ dim D(T) = n < тИЮ, рддреЛ dim R(T) тЙд n ред
(ii) If dim D(T) = n < тИЮ, then dim R(T) тЙд n.
рдЕрдерд╡рд╛ (Or)
If T : D(T) тЖТ Y is a linear operator where D(T) тКВ X and X, Y are normed spaces, then show that T is continuous if and only if T is bounded.
If X is normed space, Y is Banach space, then show that the space B(X, Y) is a Banach space.
рдЕрдерд╡рд╛ (Or)
Prove that a finite dimensional vector space is algebraically reflexive.
State and prove Schwarz inequality.
рдЕрдерд╡рд╛ (Or)
If H1 and H2 are Hilbert spaces and h : H1 ├Ч H2 тЖТ K a bounded sesquilinear form, then prove that h has a representation h(x, y) = <Sx, y>, where S : H1 тЖТ H2 is a bounded linear operator. Also prove that S is uniquely determined by h and has norm || S || = || h ||.