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Error functions

For the operation

        C +/- CE = A +/- AE o B +/- BE

the error functions used are:-

       Operator       Error Function
       --------    ----------------------
       + or - :    CE=SQRT(AE**2+BE**2)
            * :    CE=SQRT((B*AE)**2+(A*BE)**2)
            / :    CE=SQRT((AE/B)**2+(A*BE/B**2)**2)

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