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Math Help - lagrange interpolation polynomial

  1. #1
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    lagrange interpolation polynomial

    I have some difficulty understanding a step in the following solved problem on lagrange interpolating polynomials:



    So, in the 5th line of the working, how did they go from 1/2 to 4, and from 1/6 to 6? How did they change those?
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  2. #2
    MHF Contributor FernandoRevilla's Avatar
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    Re: lagrange interpolation polynomial

    Quote Originally Posted by demode View Post
    So, in the 5th line of the working, how did they go from 1/2 to 4, and from 1/6 to 6? How did they change those?

    In \mathbb{Z}_7 we have 2\cdot 4=1 so 1/2=4 etc.
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