Bolzano-Weierstrss Theorem

Discussion in 'Physics & Math' started by kingwinner, Oct 13, 2007.

  1. kingwinner Registered Senior Member

    Messages:
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    Bolzano-Weierstrass Theorem: Let S C R^n. Then S is compact (bounded and closed) iff every sequence of points in S has a convergent subsequence whose limit lies in S.

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    I am completely completely lost when reading this example.

    1. Why do we need 2 cases?

    2. How are the 2 cases different?

    3. For the second case, how come the subscripts of x_n_j and L_i_j are different? (n and i)

    4. I don't understand the solution at all, can somebody please explain it step-by-step what is happening?

    I really want to understand this example! Thanks a lot!
     

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