The software package financial.mac has Maxima code defining the functions and simple examples of many common financial functions.
Instead of a pdf file discussion, we rely on two wxMaxima worksheets and a html file summary of syntax.
The wxMaxima worksheet financial.wxm is an in depth discussion of the derivation of the various functions in financial.mac together with references to web based sources.
The wxMaxima worksheet financial_brief.wxm simply loads financial.mac and shows simple examples of each function use, together with brief definitions of terms.
The html file financial.html provides a convenient summary of the function syntax as well as financial jargon associated with the functions defined in financial.mac.