What is the history of the phrase 'an exact science'  -- where 
does this phrase come from, and why were folks like Mill, Menger, and 
Walras worried about whether or not economics should be viewed as 
'an exact science'?  Is there an article out there that might help in 
finding out? 
 
Greg Ransom 
Dept. of Philospohy 
UC-Riverside 
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