Showing that two vector spaces are equal.

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To show that two vector spaces are equal, containment in both directions is necessary. The user has successfully established containment in one direction but struggles with the reverse. They propose using specific linear combinations of vectors to express the relationship. The challenge lies in solving for the original vectors in terms of the new ones. Finding a solution for the ##v_i## in terms of the ##w_i## is crucial for completing the proof of equality between the vector spaces.
jdinatale
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I thought that I should do containment in both directions. I have containment in one direction, but the other is much harder. Any ideas?

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Call ##w_1= v_1,\ w_2 = c_{12}v_1+v_2,\ w_3 = c_{13}v_1+c_{23}v_2 + v_3## Can you solve for the ##v_i## in terms of the ##w_i##?
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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