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Irving Fisher taught a course on "The Mathematical Theory of Prices" at 
Yale 
in the early 1890s, based on his thesis, "Mathematical Investigations in 
the 
Theory of Value and Prices" (accepted as a Yale Ph.D. dissertation 1891, 
published in _Transactions of the Connecticut Academy_ 1892). Fisher was in 
the Department of Mathematics (as instructor 1891-93, assistant professor 
1893-95) before transferring to the Department of Political Economy. 
 
Robert Dimand 
Brock University 
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