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Ranges for Variables


Dear group:

This one seems simple, but a general solution evades me.
Let's say I want to tell Mathematica that every time the
variable called "a" appears it is positive, or that every
time the variable "b" appears it is between, say, 0 and 1.

This avoids searching for factors of I Pi when Mathematica
spits out output containing Log[-a] or Sqrt[b-1].  One can
write chains of "ConditionQ" statements each time a function
call is made, but is there a direct way of doing this in 
advance so that the conditions will be applied for the rest
of a Mma session?

Keith (clay at galileo.phys.washington.edu)






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