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uiulic
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Homework Statement
I am learning linear algebra (basic) and using Lang's book. In talking about vector spaces (finite dimensional only), it is easy to understand what is the dimension of the vector space (i.e. the number of elements in any basis). But I met the following case (not a vector space), in which I am puzzled.
Homework Equations
a) I know the dimension of the set of the solutions for AX=0 (usual meaning of the symbols in many textbooks,X belongs to R^n). Because such a set forms a vector space (actually a subspace), the dimension is easily understood.
b) For a non-homogeneous system of linear equations AX=B. And suppose solution(s) exist.Then what is the dimension of the set of the solutions for AX=B? The set of solutions does not form a subspace (is only a subset of R^n), so the defintion of such a dimension must be defined newly.
The Attempt at a Solution
Lang took dimension in (b) as that corresponds in (a). But he did not DEFINE it ,only CALLED it.
Thanks
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