. http://books.google.com/books?id=Sw8ZAAAAYAAJ&printsec=frontcover&dq=%22The+Theory+of+Political+Economy,%22+jevons+1871#v=onepage&q=%22The%20Theory%20of%20Political%20Economy%2C%22%20jevons%201871&f=false .   ^ a b Sheila C., Dow (1999-05-21). "The Use of Mathematics in Economics" . ESRC Public Understanding of Mathematics Seminar . Birmingham : Economic and Social Research Council . http://www.ioe.ac.uk/esrcmaths/sheila1.html . Retrieved 2008-07-06 .   ^ While the concept of cardinality has fallen out of favor in