Decimal expansions and Prime numbers

What do prime numbers have with decimal expansions? When are the decimal expansions infinite? A short proof and overview of intuition.
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Finding roots of a polynomial - numerical methods in APL

Finding roots of a polynomial - numerical methods in APL
We all know the Newton-Raphson method for approximating the zero of a real-valued function, but how do we approach the problem of finding all real and complex roots of a polynomial?
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