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Download SGBAU BSc 2019 Summer 6th Sem Mathematics Linear Algebra Question Paper

Download SGBAU (Sant Gadge Baba Amravati university) BSc 2019 Summer (Bachelor of Science) 6th Sem Mathematics Linear Algebra Previous Question Paper

This post was last modified on 10 February 2020

SGBAU BSc Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university


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B.Sc. Part-II (Semester-VI) Examination

MATHEMATICS

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(Linear Algebra)

Paper—XI

Time : Three Hours] [Maximum Marks : 60

Note :— (1) Question No. 1 is compulsory and attempt this question once only.

(2) Attempt ONE question from each unit.

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1. Choose the correct alternative (1 mark each) :

(i) S is a non-empty subset of vector space V, then the smallest subspace of V containing S is:

(a) S (b) {S}

(c) [S] (d) None

(ii) Let U and V be finite dimensional vector spaces and T : U — V be a linear map one-one and onto, then :

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(a) dim U =dim V (b) dim U ? dim V

(c) U=V (d) U=d

(iii) Let W is subspace of vector space V. Then {f ? V/f(w)=0, ? w ? W} is called as :

(a) Hilatory of W (b) Annihilator of W

(c) Dual space of W (d) None

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(iv) The normalized vector (1, -2, 5) is :

(a) (1,-2,5) (b) (1/v30, -2/v30, 5/v30)

(c) (1/30, -2/30, 5/30) (d) None

(v) In IPS V(F) the relation ||u+ v ||² + ||u-v||²=2(||u||²+ || v ||²) is called as :

(a) Schwartz inequality (b) Triangle law

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(c) Parallelogram law (d) Bessels inequality

(vi) For two subspaces U and W of V(F), V=U ? W & ..............

(a) U n W= {0} (b) V=U+W

(c) U n W={0} and V=U+W (d) None of these

(vii) Let T : M — N be an R-homomorphism. If B is a submodule then

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(a) T?¹(B) is submodule of N (b) T(B) is submodule of M

(c) T(B) is kernel of R-homomorphism (d) T(B) = T(M)

(viii) If T : U ? V then the set {T(u) | u ? U} = ..

(a) Ker T (b) R(u)

(c) R(T) (d) None of these

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(ix) If || V|| = 1, then V is called :

(a) Normalised (b) Orthonormal

(c) Scalar inner product (d) Standard inner product

(x) If V is n-dimensional, then the dimension of V* is :

(a) Less than n (b) Greater than n

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(c) Equal n (d) Zero

UNIT—I

2. (a) Let U and W be two subspaces of a vector space V and Z = U + W. Then prove that Z = U ? W iff z ? Z, z = u + w is unique representation for u ? U and w ? W.

(b) Extend the linearly independent set {(1, 1, 1, 1), (1, 2, 1, 2)} in V4 to a basis for V4.

3. (p) If U and W are finite dimensional subspaces of vector space V, then prove that : dim(U + W) = dim U + dim W - dim(U n W).

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(q) Let R? be the set of all positive real numbers. Define the operations of addition ? and scalar multiplication ? as follows :

u?v=u·v ? u,v ? R?

and a?u=u?, ? u ? R? and a ? R

Prove that R? is a real vector space.

UNIT—II

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4. (a) If U, V is a vector space over a field F and T : U ? V be a linear, then prove that : T(a1u1 + a2u2 + ... + a?u?)=a1T(u1) + a2T(u2) + ... + a?T(u?)

? u? ? U, a? ? F, 1=i=n and n?N.

(b) Let T :V4 ? V3 be a linear map defined by T(e1)= (1, 1, 1), T(e2) =(1, -1, 1); Te3) = (1, 0, 0), T(e4) = (1, 0, 1).

Verify Rank-nullity theorem.

5. (a) Find the matrix of the linear map T : V2 ? V3 defined by T(x, y) = (-x + 2y, y, -3x + 3y) related to the bases B1 = {(1, 2), (-2, 1)} and B2 = {(-1, 0, 2), (1, 2, 3), (1, -1, 1)}.

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(b) Let U and V be vector spaces over the same field F. Then prove that function T : U ? V is linear iff T(au + ßv) = aT(u) + ßT(v), ? a, ß ? F and u, v ? U

(c) If matrix of a linear map T with respect to bases B1 and B2 is :

-1 2 1

1 0 3

where B1 = {(1, 2, 0), (0, -1, 0), (1, -1, 1)} and B2 = {(1, 0), (2, 1)}, then find T(x, y, z).

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UNIT—III

6. (a) Let V be the space of all real valued continuous functions of real variable. Define T:V?V by

(Tf)(x)= ?0? f(t)dt, ?f?V, x?R

Show that T has no eigen value.

(b) Prove that if V be a finite dimensional vector space over F and v(?0) ? V, then ? f ? V* such that f(v) ? 0.

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7. (p) If W1 and W2 are subspaces of a finite dimensional vector space V, show that A(W1 + W2) = A(W1) n A(W2).

(q) If K? is eigenspace, then prove that K? is a subspace of vector space V.

(r) Define characteristic root and characteristic vector.

UNIT—IV

8. (a) In Fn define for u=(a1, a2, ..., a?) and v=(ß1, ß2, ..., ß?)

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(u, v) =a1ß1 + a2ß2 + ... + a?ß?.

Show that this defines an inner product.

(b) IF {x1, x2, ..., x?} be an orthogonal set, then prove that :

|| x1 + x2 + ... + x? ||²=||x1||² + ||x2||² + ... +||x?||²

(c) Prove that orthogonal complement i.e. W* is subspace of V.

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9. (p) If {w1, w2, .. w?} is an orthonormal set in V, then ?1n |(w?,v)|² = || v||² for any v?V.

(q) If V is a finite dimensional inner product space and w is a subspace of V, then prove that (W*)* = W.

(r) (i) Define inner product in vector space.

(ii) Define orthogonal set.

UNIT—V

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10. (a) Let A be a submodule of an R-module M and T is a mapping from M into M/A defined by T? = A+ m, ? m? M Then prove that T is an R-homomorphism of M into M/A and ker T = A.

(b) Let T be a homomorphism of an R-module M to an R-module H. Prove that T is one-one iff ker T = {0}.

(c) Define :

(i) Submodule

(ii)) Unital R-module.

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11. (p) If A and B are submodules of M, then prove that (A+B)/B is isomorphic to A/(AnB)

(q) Prove that arbitrary intersection of submodules of a module is a submodule.

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