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precision of floating-point-numbers


can anybody tell me how $MinPrecision works.
If I set $MinPrecision=100 and type:
[In] 1. - 1.*10^-20
i get
[Out] 1.
If I type 
[In] SetPrecision[1., 100]-SetPrecision[1., 100]*10^-20
i get

I want to set all calculation to minimum precision, how can I do this?

Thank You
Martin Stockhammer

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