In each case determine if the given vectors span R4. Support your answer. {[1 1 1 1], [0 1 1 1], [0 0 1 1], [0 0 0 1]}.
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One way: express: and prove that for all the system has solution on the unknowns . Fernando Revilla
Another (simpler) way: Let the given vectors be . , which is the standard basis in .
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