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Math Help - power series.

  1. #1
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    power series.

    another power series problem. Need to find the interval of convergence,

    1/(1-x^3)

    can you take a look at this one please.
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by rcmango View Post
    another power series problem. Need to find the interval of convergence,

    1/(1-x^3)

    can you take a look at this one please.
    1/(1-x) = 1 + x + x^2 + ...

    which is convergent inside the unit circle |x|<1,

    so:

    1/(1-x^3) = 1 + x^3 + x^6 + ... + x^{3n} + ...

    which is convergent inside the unit circle |x|<1,

    RonL
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