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7 November, 21:56

Check the true statements below:

a. A single vector by itself is linearly dependent.

b. If H = Span{b1, ... bp}, then {b1, ... bp} is a basis for H.

c. The columns of an invertible n / times n matrix form a basis for R^n.

d. In some cases, the linear dependence relations amoung the columns of a matrix can be affected by certain elementary row operations on the matrix.

e. A basis is a spanning set that is as large as possible.

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Answers (1)
  1. 7 November, 23:11
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    a) False

    b) False

    c) True

    d) False

    e) False

    Step-by-step explanation:

    a. A single vector by itself is linearly dependent. False

    If v = 0 then the only scalar c such that cv = 0 is c = 0. Hence, 1vl is linearly independent. A set consisting of a single vector v is linearly dependent if and only if v = 0. Therefore, only a single zero vector is linearly dependent, while any set consisting of a single nonzero vector is linearly independent.

    b. If H = Span{b1, ... bp}, then {b1, ... bp} is a basis for H. False

    A sets forms a basis for vector space, only if it is linearly independent and spans the space. The fact that it is a spanning set alone is not sufficient enough to form a basis.

    c. The columns of an invertible n * n matrix form a basis for Rⁿ. True

    If a matrix is invertible, then its columns are linearly independent and every row has a pivot element. The columns, can therefore, form a basis for Rⁿ.

    d. In some cases, the linear dependence relations among the columns of a matrix can be affected by certain elementary row operations on the matrix. False

    Row operations can not affect linear dependence among the columns of a matrix.

    e. A basis is a spanning set that is as large as possible. False

    A basis is not a large spanning set. A basis is the smallest spanning set.
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