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12 June, 09:23

Prove Corollary 6.2. If L : V? W is a linear transformation of a vector space V into a vector space W and dim V=dim W, then the following statements are true: (a) If L is one-to-one, then it is onto. (b) If L is onto, then it is one-to-one.

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  1. 12 June, 09:33
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    Answer with explanation:

    Given L: V/rightarrow W is a linear transformation of a vector space V into a vector space W.

    Let Dim V = DimW=n

    a. If L is one-one

    Then nullity=0. It means dimension of null space is zero.

    By rank - nullity theorem we have

    Rank+nullity = Dim V=n

    Rank+0=n

    Rank=n

    Hence, the linear transformation is onto. Because dimension of range is equal to dimension of codomain.

    b. If linear transformation is onto.

    It means dimension of range space is equal to dimension of codomain

    Rank=n

    By rank nullity theorem we have

    Rank + nullity=dimV

    n+nullity=n

    Nullity=n-n=0

    Dimension of null space is zero. Hence, the linear transformation is one-one.
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