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Re: parameter restrictions
Given that the Mathematica language does not use data types, there is not a definite way to establish the domain of a "variable"(*). I recommend using something like Simplify[expr, conditions] where expr is the expression you wish to analyse and conditions is a conjunction of inequalities. For instance: Simplify[Log[x]>0,x>1] returns True Orestis (*) I use quotes around the word "variables", since what you normally perceive as variables are actualy 'symbols'. This explains the absence of a 'domain' mechanism. Check the Big Book..