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Homework Statement
Prove that if in a system of vectors: [itex]S_a =\{a_1, a_2, ..., a_n\} [/itex] every vector [itex]a_i[/itex] is a linear combination of a system of vectors: [itex]S_b = \{b_1, b_2, ..., b_m\}[/itex], then [itex]\mathrm{span}(S_a)\subseteq \mathrm{span}(S_b)[/itex]
Homework Equations
The Attempt at a Solution
We know due to [itex]a_j[/itex] being a linear combination, that every [itex]a_j\in S_a = \sum\limits_{j=1}^m c_j\cdot b_j[/itex] where [itex]b_j\in S_b, c_j\in\mathbb{R}\setminus\{0\}[/itex]
But where should I go from here? Suggestions?