After my evaluations I have an error: N::meprec: Internal precision limit $MaxExtraPrecision=50. reached while evaluating ... General::stop: Futher output of N::mecprec will be supressed during this calculation. As as I might guess, the problem is that I am evaluating very big numbers, and the precision limit is ended. But what that means for my number: how big will be the suppression? Can I do something to reduce this error? If the suppression is not very big (for example only from the 50th decimal number), how can I store this value, to have possibility to use them in Reduce function, because when I want to use this value I have an error: Unable to decide whether numeric quantity ... is equal to zero. Assuming it is. How can I make to NOT assuming it is zero? - ## 1 Answer Try putting the problem child inside of Block[{$MaxExtraPrecision = 1000},...].

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Thanks, it really helps. But with Reduce function I have still the same problem, because I have error that: Unable to decide whether numeric quantity ... is equal to zero. Assuming it is. How can I make to NOT assuming it is zero? – Ziva Jan 20 '14 at 11:09
@Ziva: Would need more details on what you're doing and exact contents of error. Perhaps update your OP. Also, see mathematica.stackexchange.com/questions/18381/…` for related information. – ciao Jan 20 '14 at 11:17