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Q: multiprecision question


I am new to the mathematica so my problem might be naive. I am now doing
some research on the extrapolation from real axis to the complex plane,
by using the analytic continuity property in complex variable. However,
due to the finite precision of Fortran and Matlab, the result is not
very accurate. I heard that mathemaica can perform the computation by
specify the precision. My question is: Is that possible in mathematica?
How to do that? i.e. If I want, say 100 decimal, how can I let
mathematica know that?


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